Global Action on SDGs: Policy Review and Outlook in a Post-Pandemic Era

: The 2030 Agenda for Sustainable Development provided brand new goals and action targets for human well-being and development, but the COVID-19 pandemic has cast a shadow on the implementation of the Sustainable Development Goals (SDGs). It is therefore essential to provide a reference for making policy adjustments and transformations to promote the realization of SDGs in the post-pandemic era. Based on a literature review of the progress and policies of SDGs across countries worldwide, we ﬁnd that research on sustainable policies has rapidly increased since the SDGs issued in 2015 with particular focuses on eco-environment, sustainable policies, green economy, sanitation and health, and water sanitation. Most countries are in the process of nationalization, institutionalization, and universalization of the SDGs through incorporating the SDGs into national development frameworks, enabling extensive participation and negotiation mechanisms, and promoting the SDGs’ national publicity. Countries of different economic and institutional backgrounds demonstrate divergent development pathways, priorities, measures, and progress in the implementation of SDGs. Despite signiﬁcant global progress during the last ﬁve years, the North–South divide emerges in the policy action and achievement of SDGs. The least developed countries in sub-Sahara Africa and South Asia appear to be difﬁcult or even unable to implement the SDGs and monitor the progress. In the post-pandemic era, particular attention shall be given to integrating SDGs and achieve synergy among goals, concretizing short-and medium-term priorities toward the SDGs targets for all countries, strengthening multilateralism and global cooperation among countries and continents, providing reliable data and approaches for real-time impact assessment and process monitoring, and promoting an inclusive engagement and integrative implementation with multiple stakeholders and consortiums.


Introduction
Sustainable development is the common goal of humankind and is necessary to achieve human well-being. In 2015, 193 countries around the world passed the "Transforming Our World: The United Nations 2030 Agenda for Sustainable Development" at the United Nations Sustainable Development Summit and proposed a set of 17 sustainable development goals (SDGs) and 169 targets to guide international development, specifically with regard to society, the economy, and the environment. This is the inheritance of the agenda of the new millennium. The 17 goals revolve around themes that are closely related to human prosperity, such as poverty, ticles in 2020. Research on sustainable development emerged in the 1980s, and the research on sustainable development policies has grown rapidly since the 21st century. The occurrence year and frequency of Subject terms on "SDGs and Policy" from 1981 to 2020 were identified using Citespace (Table 1). It demonstrates that "sustainable development" has always been the core keyword of research, as it has the highest frequency of occurrence. Sustainable development policy and environmental policy became hot spots in 1997, and green economy, energy policy, and climate change began to become hot spots in 2011. In recent years, climate policy, cultural policy, and climate action have attracted attention from scholars. The global climate policy and SDG agendas are highly interconnected [24], and cultural policy can and should play a more active role in shaping social change [25].   Since the implementation of the UN SDGs in 2015, the Web of Science core library has published 2218 articles related to SDGs. The search format is designed as: (TI = (SDG × OR sustainable development goal × OR 2030 agenda)) AND LANGUAGE: (all languages) AND DOCUMENT TYPES: (all document types) Indexes = SCI-EXPANDED, SSCI, CPCI-S, CPCI-SSH, Timespan = 2015-2020. Using the VOSviewer software to conduct keyword co-occurrence network analysis, we found that the most frequently cited articles around the world focus on the eco-environment, sustainable policies, green economy, health, water sanitation, and other topics in the SDGs, and the different topics are closely related ( Figure 2). According to the keyword co-occurrence, there are three research subnetworks, which are displayed in different colors in Figure 2. One is related to the SDGs' priority in health, gender equality, and children; the second is the water-food ecosystem nexus; the third is about the measures, challenges, and difficulties of SDGs attainment. Since the implementation of the UN SDGs in 2015, the Web of Science core library has published 2218 articles related to SDGs. The search format is designed as: (TI = (SDG × OR sustainable development goal × OR 2030 agenda)) AND LANGUAGE: (all languages) AND DOCUMENT TYPES: (all document types) Indexes = SCI-EXPANDED, SSCI, CPCI-S, CPCI-SSH, Timespan = 2015-2020. Using the VOSviewer software to conduct keyword co-occurrence network analysis, we found that the most frequently cited articles around the world focus on the eco-environment, sustainable policies, green economy, health, water sanitation, and other topics in the SDGs, and the different topics are closely related (Figure 2). According to the keyword co-occurrence, there are three research subnetworks, which are displayed in different colors in Figure 2. One is related to the SDGs' priority in health, gender equality, and children; the second is the water-food ecosystem nexus; the third is about the measures, challenges, and difficulties of SDGs attainment.

Policy Review of Different Countries to Implement the SDGs
This article summarizes the main practices of OECD countries, BRICs countries, and LDCs in implementing the 2030 Agenda for Sustainable Development, by their development levels. As part of its follow-up and review mechanisms, the 2030 Agenda encourages member states to "conduct regular and inclusive reviews of progress at the national and subnational levels, which are country-led and country-driven" [26]. The voluntary national reviews (VNRs) are an opportunity for countries to share their successes, challenges, and lessons learned, accelerating the implementation of the 2030 Agenda. Although they are not compulsory, as of April 2021, 168 countries have submitted VNRs to the annual meeting of the High-Level Political Forum on Sustainable Development. References in this section come from various kinds of government documents, research papers, and reports, in addition to the VNRs submitted by various countries.

OECD Countries
OECD countries are generally concerned about global natural environmental issues. OECD countries are at an advanced stage in achieving various SDGs (e.g., Sweden, Denmark, Norway, and Switzerland). For individual goals, such as No Poverty (Goal 1) and Zero Hunger (Goal 2), efforts are given to improving social welfare, especially for vulnerable groups such as children and the disabled. Iceland and Switzerland prioritize Sustainable Consumption and Production (Goal 12) in their policy implementation. Canada emphasizes No Poverty (Goal 1), Gender Equality (Goal 5), Decent Work and Economic Growth (Goal 8), Sustainable Consumption and Production (Goal 12), Climate Action (Goal 13), and Life below Water (Goal 14). Austria regards Good Health and Well-being (Goal 3), Gender Equality (Goal 5), and Climate Action (Goal 13) as the priority for achieving SDGs. Denmark adopts Industry, Innovation, and Infrastructure (Goal 9), Life below Water (Goal 14), and Life on Land (Goal 15). Norway takes Quality Education (Goal 4), Decent Work and Economic Growth (Goal 8), and Sustainable Consumption and Production (Goal 12) as priority implementation areas. Meanwhile, Iceland believes that the realization of Sustainable Consumption and Production (Goal 12) and Climate Action (Goal 13) is the current challenge, and Denmark has challenges in the realization of Industry, Innovation, and Infrastructure (Goal 9), Sustainable Cities and Communities (Goal 11), and Sustainable Consumption and Production (Goal 12).
Most countries have responded to the United Nations "the 2030 Agenda" and are launching suitable action plans. In 2016, the European Union released a sustainable development package plan along with "The Future of Sustainable Europe: The EU's response to the 2030 Agenda for Sustainable Development," which systematically explained the EU's measures to implement the goals of the 2030 Agenda for Sustainable Development [27]. The UK government published "Agenda 2030: The UK Government's approach to delivering the Global Goals for Sustainable Development-at home and around the world" [28], which provided an approach to delivering the Global Goals for Sustainable Development at home and around the world. Spain is committed to achieving the highest level of SDGs, focusing national public policy and political priorities on achieving SDGs [29]. The Swedish government's ambition is to be a leader in implementing the 2030 Agenda-both at home and globally [30].
OECD countries are widely participating in international assistance and are committed to the realization of global SDGs. For example, the UK issued the "British Aid Strategy" in 2015 [31]. The US Agency for International Development is committed to the realization of global SDGs through existing initiatives and programs such as "Feed the Future", "Global Labor Plan", and the "US Government Education Strategy" [32]. Canada announced its new Feminist International Assistance Policy in 2017 [33]. Norway actively provides marine environmental protection assistance to developing countries by implementing multilateral mechanisms such as the Green Climate Fund, providing climate financing to vulnerable countries in LDCs, supporting the promotion of renewable energy in African and Asian countries, etc. [34]. Austria uses its position as the official seat of international organizations to promote sustainable development on a global level [35]. Germany is committed to the goal of using 0.7% of its gross national income for ODA within the 2030 Agenda and plans to double international climate financing by 2020 [36].
OECD countries are committed to developing global partnerships and promoting the implementation of the SDGs through extensive cooperation. With capital, talents, and tech-nology, OECD countries will promote the deepening of global development partnerships by leading the "Global Partnership for Effective Development Cooperation" and occupying a dominant position in the international order for solving global environmental problems. This will facilitate exchanges among its member states as well as deepen international cooperation with other developing countries. Norway maintains substantial investments in global health, women, and children, establishing partnerships in the private sector, vaccine alliances, and global education [34]. Switzerland has contributed to the effort by strengthening domestic resource mobilization and capacity building, and by promoting a universal, rules-based, multilateral trading system [37].

BRICS Countries
Government plans dominate in the process of implementing SDGs. India has fully coordinated and led the realization of SDGs through NITI Aayog, chaired by the Prime Minister (https://niti.gov.in/, accessed on 25 May 2021). China incorporated SDGs into the "14th Five-Year" National Economic and Social Development Plan Outline, translated SDGs into specific tasks in the economic, social, and environmental fields [38], and eradicated absolute poverty by 2020 under the long-term efforts of the government, which provided a strong impetus to the cause of global poverty reduction [39]. Brazil connects SDG targets and indicators with Plano Plurianual (PPA) attributes, linking the medium-term vision of government action with the expectation of implementing the commitments contained in the SDGs. South Africa has established the Inter-Ministerial Committee on the Sustainable Development Agenda and the National Development Stakeholder Forum to strengthen the dialogue on SDGs [40]. Russia has 12 National Projects and has created the Comprehensive Plan for the Modernization and Expansion of Main Infrastructure, which is aimed at SDG achievement [41].
BRICS countries are actively involved in the development of international cooperation and regional cooperation. The scope of partnership among different countries depends on national strength. China and India tend to strengthen their global partnerships, but South Africa and Brazil tend to strengthen partnerships at the regional level. China has promoted the establishment of a global partnership for the implementation of SDGs through the "Belt and Road" initiative [42]. India has actively contributed to the crafting of policy coalitions such as the International Solar Alliance, Coalition for Disaster Resilience Infrastructure, India-Africa Forum Summit, India-CARICOM, the Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation, etc. [43]. Russia actively promotes regional cooperation among the countries of Eastern Europe, Transcaucasian and Central Asian countries, and the countries of the Asia-Pacific region. The implementation of such cooperation is reflected in the framework of multilateral and regional associations such as EAEU, BRICS, SCO, ASEAN, ASEM, and APEC [41]. South Africa would assist Africa in coordinating representation in the United Nations Multi-Stakeholder Forum for Science, Technology, and Innovation for the SDGs, and has also been active in supporting collaborative research projects with other African countries to improve the use of technology in addressing the SDGs [43].
BRICS countries are generally willing to provide international support within their capacity. China provides voluntary support to developing countries in terms of funding, technology, and capacity building, and provides beneficial public products for global development. In 2017, China announced that it would provide CNY 2 billion of emergency food aid to developing countries along the "Belt and Road" and invest USD 1 billion in the South-South Cooperation Assistance Fund, as well as support the implementation of 100 Happy Home Projects, 100 Anti-Poverty Projects, 100 Health Recovery Projects in countries along the "Belt and Road" (http://www.chinadaily.com.cn/china/2017-05/16 /content_29359377.htm, accessed on 25 May 2021) This encouraged the Asian Infrastructure Investment Bank and the BRICS New Development Bank to play a greater role in providing international support [44]. According to the Ministry of Finance of the Russian Federation, the 2018 federal budget expenditures classified as official development assistance (ODA) under the OECD methodology reached almost USD 1 billion [41], and the main recipients of such assistance are Latin American and CIS countries. India has committed a total of USD 150 million over a decade to the India-UN Development Partnership Fund [43].

Least Developed Countries (LDCs)
LDCs tend to prioritize the implementation of basic and urgent SDGs. Due to limited financial and facility conditions, LDCs tend to give priority to achieving goals for solving people's basic needs. For example, in Malawi, more efforts have been dedicated to Health (Goal 3), Education (Goal 4), Gender (Goal 5), Clean Water and Sanitation (Goal 6), Sustainable Cities (Goal 11), and Strong Institutions (Goal 16) [45]. Sierra Leone has prioritized Education (Goal 4) and Access to Justice (Goal 16) [46]. Bhutan prioritizes No Poverty (Goal 1), Climate Action (Goal 13), and Life on Land (Goal 15) [47]. The reduction of poverty and hunger are at the core of Zambia's national development agenda [48].
LDCs actively sought international support. The Turkish President called on the UN member states to maintain meaningful ODA support, which constitutes the most important source of funding for LDCs [49]. The international community has pledged to provide Afghanistan with a total of USD 15.2 billion in aid for five years (2017-2021) [50]. The United Nations Country Team (UNCT), including IMF, World Bank, and African Development Bank continue to play a key role in the development of Sierra Leone. In 2017, the total ODA by the top 10 donors in Sierra Leone amounted to USD 490.3 million [46]. ODA funds about 34 percent of Bhutan's development programs, and Bhutan has been effectively utilizing ODA to the maximum benefit [47].
There are some obstacles to the implementation of the SDGs, which include insufficient government finances, a large population, insufficient capacity to collect statistics, and a shortage of government enforcement. Implementation capacity gaps, comprising perceptions, technical know-how, technology, finances, etc. are also considered serious challenges to be dealt with in the effort to eradicate poverty in all its manifestations by 2030 [51]. For instance, 70% of the total expenditure budget of Ethiopia is being used to fund five sectors: education, health, agriculture, water and sanitation, and rural road construction, which means that the other SDGs lack financial support, and thus are difficult to achieve [52]. The sheer number of poor people is also a huge challenge for Bangladesh [53].

Main Policy Measures to Achieve SDGs in Various Countries
Creating ownership of the SDGs. The 2030 Agenda is a comprehensive agenda that requires all stakeholders' cooperation and contributions to ensure an open and transparent participatory process. To achieve the SDGs by 2030, innovative practices and solutions including multi-stakeholder cooperation and diversification of funding sources should be developed [54]. To realize this, it is important to ensure the ownership of all relevant parties [49]. Governments in most countries are responsible for the implementation of the 2030 Agenda by making political commitments and mobilizing stakeholders' involvement. For example, Bhutan developed an SDGs communications strategy to create further awareness and ownership of SDGs [47]. Laos implemented policy decisions to ensure ownership of the SDGs [55]. The government of Thailand invited all sectors at all levels to engage in the VNR process and join hands in designing the path to achieve SDGs [56].
Build an inclusive political commitment and strong leadership for SDGs at the highest political level. The institutionalization process is an important political guarantee to foster whole government approaches to the SDGs. The continuous improvement and necessary adaptation of legislation to the SDGs framework are achieved through the adoption of an integrated approach of the legislative process (planning, drafting, implementation, evaluation) at all stages [57]. For example, the national SDGs of Austria are set down in the Federal Constitutional Act on animal protection, comprehensive environmental protection, water, and food security [35]. Moreover, the working mechanism for the SDGs nationalization process began with the creation of various specialized agencies in several countries Sustainability 2021, 13, 6461 8 of 25 (Japan, Afghanistan, Canada, etc.). Pakistan's Parliament became the first to establish an SDG Unit dedicated solely to the 17 goals [51]. Meanwhile, some countries, such as Turkey and Ethiopia, use their well-established mechanisms for implementing the goals at the national level. Enhancing and institutionalizing performance-based monitoring and strengthening accountability mechanisms for civil servants are also important measures. For example, SDGs have been mainstreamed in performance contracting guidelines as a weighted area in the performance matrix in Kenya [58].
Incorporate the SDGs into national development frameworks. The 2030 Agenda stated that when implementing SDGs, it is necessary to consider the reality, capacity, and level of development of a specific country, and respect the country's development strategy and priority projects. Most countries are in the process of the "nationalization" of international policies, integrating the 2030 Agenda with national strategies and plans, and integrating the economic, social, and environmental dimensions in a balanced manner. For example, the "Europe 2020 Strategy" basically covers all the SDGs [27]. About 79.9% of the SDGs are reflected in the documents of the national planning system in Kazakhstan [59]. Approximately 86% of the SDGs have the same attributes as Brazil's 2016-2019 Plano Plurianual (PPA) [40]. About 74% of the SDGs are included in the South African National Development Plan coverage [60]. Meanwhile, the implementation of SDGs and integration of the three dimensions relies on strategic documents, such as the "National Poverty Reduction Strategy 2019-2023" and the "National Energy and Climate Comprehensive Plan 2021-2030" in Spain [61] and the "Norwegian Biodiversity Action Plan" in Norway [62]. Romania also published the "Sustainable Development Strategy 2030" [63], and India's NITI Aayog incorporates the SDGs into central ministries, centrally funded programs, and major government initiatives [43].
Establish national SDGs and indicator systems. Some countries have modified or created a set of national indicators, according to their national conditions, based on the UN SDGs, while other countries have directly adopted the UN indicators for assessment work [64]. Different countries have formulated diverse priorities, which may not always be within the scope of 17 goals. For example, landlocked countries (e.g., Kazakhstan, Armenia, Bhutan) generally did not take effective measures against Life below Water (Goal 14). Lao PDR formally launched and adopted its own national Goal 18 called, "Lives safe from unexploded ordnance" [55]. Afghanistan reclassified the SDGs into 125 national goals and 190 national targets applicable to Afghanistan [50]. Germany has added 13 new areas and 30 indicators following the 2030 Agenda [65]. Austria has set digitalization as a priority, and digital transformation is also being used as a means to implement the 2030 Agenda [35]. Canada has made reconciliation with indigenous people and the renewal of nation-to-nation relationships a priority [33].
Build a national monitoring and evaluation framework for SDGs. Many countries have described how to establish monitoring and evaluation systems at the national level (e.g., Canada, Mexico). The statistical agencies of most countries have undertaken this task (Turkey, Russia, Thailand, etc.). The integrated assessment tool of the United Nations is widely used to assess the level of integration of the SDGs and targets into the documents of the national planning system. New institutions in some countries are responsible for such data collection and policy evaluation. For example, Bangladesh established the "National Data Coordination Committee (NDCC)" to identify data gaps and ensure the availability of high-quality data [53]. Thailand established the "Sub-Committee on Developing Information System" to support the decision making and policy design of the Sustainable Development Committee and relevant agencies [56]. Moreover, some countries, such as Finland and Romania, have established a sustainable development expert group. Some countries tend to use existing agencies to monitor and evaluate the progress of the goals. For example, Israel stated that it would not establish a new special supervision agency [66] and Sweden will assign this work to the responsible persons of relevant ministries [30]. Enable extensive participation and negotiation mechanisms. The 2030 Agenda puts forward higher requirements for the coordination of policies and actions among global, regional, and national administrative agencies. From the establishment of inter-ministerial coordination to broader social and public participation in the implementation of the agenda, extensive participation and consultation mechanisms have been adopted in most counties. Many countries believe that the institutional framework plays a vital role in promoting sustainable development, and have established horizontal coordination mechanisms among departments (e.g., Saudi Arabia, Greece, and Mauritius). For example, the Coordination Board on SDGs was established in Kazakhstan [59]. Nonetheless, the negotiation mechanism between national-level institutions and local-level institutions is relatively lacking. For example, not all cities link their work explicitly with the 2030 Agenda in Finland [67]. Before formulating sustainable development policies and submitting VNR, governments of most countries engage in dialogues with stakeholders and other relevant parties, which include civil society, international organizations, the private sector, independent experts, etc. These dialogues often improve the quality of government actions and increase public acceptance of decisions. For example, 17 SDGs were distributed among public and private sectors, NGOs, and local administrations to ensure a wide range of stakeholders' contributions in Turkey [49]. Germany plans to hold 2-3 regular dialogue forums every year [36].
Strengthen the publicity of the SDGs. Most countries attach great importance to raising public awareness and enhancing public participation in the SDGs, which actively promotes the universalization process of the SDGs. For example, Brazil has established several public participation platforms such as the 2030 Agenda platform, dialogue with Brazil, etc. [40]. The Norwegian Ministry of Education recommends including SDGs in school curricula and disseminating knowledge about SDGs [34]. In addition, many countries also pay attention to youth education and participation in the SDGs (e.g., Japan, Denmark, Austria, Finland, and Mauritius), as well as promoting increased awareness of, commitment to, and ownership of the agenda among youth organizations and young people. For example, Japan educates the next generation of youth on sustainable development and rewards schools, families, communities, and units that have been trained on sustainable development knowledge [68].
Provide reliable data and measurable indicators at the national and regional levels. Data collection and statistical work are common problems for all countries [23], which limits progress in setting and assessing interlinkages between targets and policy evaluation. Countries, especially the LDCs in South Asia and Africa, may need support from the United Nations system to improve their data collection capabilities and the ability to evolve or adapt to abrupt challenges (e.g., the COVID-19 pandemic) and long-lasting change (e.g., climatic shifts) [69,70]. Thereafter, evidence-and science-based approaches can be developed and applied for indicator-based assessments, benchmarking, integrated approaches, and system analysis and modeling in time and space to support policy implementation and sustainable development at multiple scales in different contexts [71].

Variances in Policy Implementation across Countries
Priorities and focus areas are different. LDCs pay more attention to indicators in terms of reducing vulnerability, enhancing resilience, and responding to urgent needs (e.g., Pakistan) [51]. However, OECD countries pay more attention to global environmental issues, and further strengthen and improve the level of welfare based on the already achieved goals (e.g., the UK and Italy). For example, sustainable natural resource management and climate change mitigation and adaptation are priority areas for Norway [34]. Switzerland faces the challenge of reducing the negative impact of domestic consumption on people and the environment in other countries [37]. The Ethiopian government has identified 10 national priority development areas, which are mainly focused on economic development and urban construction [52], in its Second Five Year Growth and Transformation Plan. The focus areas of Tajikistan's development for the next 15 years are energy, transportation, food, and employment [72].
Governance and management systems are divergent. Some countries have taken top-down and step-by-step transmission measures in which their central coordination agencies are very important to the implementation processes (e.g., China, India, and Russia). For example, China has established an inter-ministerial coordination mechanism for the implementation of the 2030 Agenda, forming a level of "central-local-basic" implementation mechanisms [38]. In decentralized countries, local governments have greater powers, and the SDGs are mainly implemented through local government plans and urban development plans (e.g., America, Pakistan, and Norway). For example, the "Nature Model" is being developed for the District level in Bangladesh and a framework is being finalized for localizing SDGs at the subdistrict level [53]. Overall, the goals' achievement ultimately depends on the ability of local and national governments to promote integrated, inclusive, and sustainable development.
The Matthew effect seems demonstrated in the implementation of the SDGs. Based on the Sustainable Development Report 2020 [73], the lower the income level of the country, the less progress (on track, maintaining, or increasing) on the implementation of SDG targets. The gap in policy action is a general trend across countries all over the world. OECD countries have a higher enthusiasm and initiative for implementing the SDGs. On the other hand, LDCs have a relatively regressive execution power due to factors such as lack of financial funds and political turmoil. For example, the 2030 Agenda is already at the heart of Spain's government action and is a priority across Spain's political spectrum [61]. Sweden is committed to becoming a leader in implementing the 2030 Agenda-both at home and by contributing to its global implementation [30]. Liberia recognizes that fiscal space is limited, and institutional knowledge and knowledge retention on the related policies and strategies are weak areas [69]. Political turmoil remains in countries such as Myanmar and Kyrgyzstan, which would affect the continuous implementation of the SDGs. Thus, the Matthew effect shall be taken into account to fully achieve SDGs worldwide.
Regional cooperation led by developed and emerging countries sets up global partnerships. OECD or emerging countries make full use of their existing foreign aid policies or regional alliances to further strengthen global or regional cooperation (e.g., US, Britain, India, China, and South Africa). For example, Nordic Countries aim to improve the visibility of the Nordic Council of Ministers' work both in the Nordic Region and internationally [67]. India strengthens South-South Cooperation through financing to its African partners and launching the Indian Technical and Economic Cooperation program across the developing world [43]. Regional organizations (EU, ASEAN, G20, etc.) have formulated their sustainable development strategy or action plan to strengthen internal connections and cohesiveness to improve the regional voice. For example, EU countries emphasize the development of partnerships and assess and predict the relative position of countries in achieving SDGs in the international framework [74,75]. G20 members contribute to the implementation of the 2030 Agenda by taking bold transformative steps through both collective and individual concrete actions at international and domestic levels [76].
The impact of COVID-19 varies. LDCs are extremely vulnerable to the impact of COVID-19 and have compounded all aspects of socioeconomic development [77]. They are unlikely to receive more international assistance soon and face a greater financial burden (e.g., Kenya, Liberia, Nepal, and Afghanistan) [78]. For example, the likelihood of Liberia being able to meet the SDGs seem relatively low, especially given the challenges posed by the COVID-19 outbreak and the projected decline in foreign aid assistance that will result from the pandemic [69]. OECD countries and BRICS countries are affected by COVID-19 and pay more attention to relevant goals of economic and social development in the short term. For example, Finland plans to invest in employment actions, promote the circular economy, perform social and healthcare reformation, increase productivity, and limit expenditure growth under the impact of COVID-19 [67]. Russia approved the Plan of High-Priority Measures (Actions) to ensure the sustainable development of the economy in the context of the deterioration of the situation due to COVID-19 [41].

The Progress of SDGs under the Policy Implementation
According to the Sustainable Development Report 2020 [73], we mapped the implementation of SDGs (Figure 3) while comparing the progress and changes over different regions and representative countries (Figure 4). The SDG Index tracks country performance on the 17 SDGs with equal weight to all 17 goals. The score signifies a country's position between the worst (0) and the best or target (100) outcomes. All underlying data are made available publicly on www.sdgindex.org (accessed on 25 May 2021). From a spatial perspective, the SDG Index is relatively low in sub-Saharan Africa, South Asia, and Southeast Asia, which are the concentrated areas of LDCs. Among them, Sub-Saharan Africa countries show an absolute low value of the SDG Index, and it is difficult for them to realize the SDGs. In contrast, the SDG Index is relatively high in North America and Western Europe, which consist mostly of OECD countries. Among them, the Nordic Council countries and Canada show an absolute high value of the SDG Index, but they still face the problems of climate change and sustainable use of energy. BRICS countries have a middle value, while China has a relatively high value in comparison.
Liberia being able to meet the SDGs seem relatively low, especially given the challenges posed by the COVID-19 outbreak and the projected decline in foreign aid assistance that will result from the pandemic [69]. OECD countries and BRICS countries are affected by COVID-19 and pay more attention to relevant goals of economic and social development in the short term. For example, Finland plans to invest in employment actions, promote the circular economy, perform social and healthcare reformation, increase productivity, and limit expenditure growth under the impact of COVID-19 [67]. Russia approved the Plan of High-Priority Measures (Actions) to ensure the sustainable development of the economy in the context of the deterioration of the situation due to COVID-19 [41].

The Progress of SDGs under the Policy Implementation
According to the Sustainable Development Report 2020 [73], we mapped the implementation of SDGs (Figure 3) while comparing the progress and changes over different regions and representative countries (Figure 4). The SDG Index tracks country performance on the 17 SDGs with equal weight to all 17 goals. The score signifies a country's position between the worst (0) and the best or target (100) outcomes. All underlying data are made available publicly on www.sdgindex.org (accessed on 25 May 2021). From a spatial perspective, the SDG Index is relatively low in sub-Saharan Africa, South Asia, and Southeast Asia, which are the concentrated areas of LDCs. Among them, Sub-Saharan Africa countries show an absolute low value of the SDG Index, and it is difficult for them to realize the SDGs. In contrast, the SDG Index is relatively high in North America and Western Europe, which consist mostly of OECD countries. Among them, the Nordic Council countries and Canada show an absolute high value of the SDG Index, but they still face the problems of climate change and sustainable use of energy. BRICS countries have a middle value, while China has a relatively high value in comparison.  Some goals have been achieved ahead of schedule in some countries. For example, Norway is leading in achieving SDGs in terms of No Poverty (Goal 1), Good Health and Well-being (Goal 3), Gender Equality (Goal 5), Affordable and Clean Energy (Goal 7), Reduced Inequalities (Goal 10), and Partnerships (Goal 17). OECD countries and high-income countries have achieved No Poverty (Goal 1), Quality Education (Goal 4), and Industry, Innovation, and Infrastructure (Goal 9) for basic human living. Ethiopia, Sierra Leone, and Bangladesh have achieved or gained large progress in Sustainable Consumption and Production (Goal 12) and Climate Action (Goal 13) probably due to their natural ecological conditions and primitive economic production methods. Nevertheless, most countries are still in the initial stage of implementing the SDGs, facing challenges in achieving Zero Hunger (Goal 2), Good Health and Well-being (Goal 3), Reduced Inequalities (Goal 10), and Peace, Justice, and Strong Institutions (Goal 16) for high-quality life and national governance. It seems more difficult for low-income countries to achieve

Implementation of the SDGs in a Post-Pandemic Era
The COVID-19 outbreak is a major setback to the world's ability to achieve the SDGs, particularly for poor countries and vulnerable groups [23]. Likely, many of the 169 targets will not be achieved by 2030. The United Nations has confirmed an unwelcome suspicion: the COVID-19 has put the SDGs out of reach. Most of the goals, such as end poverty, protect the environment, and support well-being by 2030, were already off course. Now, what little progress had been made has been stopped in its tracks [79]. An estimated 71 million people are expected to be pushed back into extreme poverty in 2020 [23]. If not properly addressed through policy, the social crisis created by the COVID-19 pandemic may also increase inequality, exclusion, discrimination, and global unemployment in the medium and long term [80]. Meanwhile, some experts believe that the COVID-19 may help spur efforts to realize the UN's 2030 Agenda [81], and there might also be some positive developments in the long term [82]. Ambition to achieve the goals is as important as ever, but the pandemic has required countries to revise their strategies for achieving them. We have to discuss whether the SDGs are deserved to be revised or whether the time point to achieve them needs to be delayed. We should increase the resilience of the goals and set different priorities for different countries.
As COVID-19 batters the world and its economy, it's time to rethink sustainable pathways for the future of human beings. The COVID-19 has irreparably altered at least some of the SDGs' underpinning assumptions-sustained economic growth and globalization. Some scholars believe that it is unlikely there will be enough money or attention to banish poverty and inequality, expand health services and overturn biodiversity loss and climate change, all by 2030 [16,77]. Therefore, we may adjust the path and focus of the next phase of the SDGs' implementation in a post-pandemic era. We suggest five key points to take into account ( Figure 5): integrate SDGs and maximize synergies between goals; set priorities for achieving short-and long-term goals; strengthen global cooperation; assess and predict the progress of the SDGs timely; promote the integration of science, technology, policy and practice (STPP).
properly addressed through policy, the social crisis created by the COVID-19 pandemic may also increase inequality, exclusion, discrimination, and global unemployment in the medium and long term [80]. Meanwhile, some experts believe that the COVID-19 may help spur efforts to realize the UN's 2030 Agenda [81], and there might also be some positive developments in the long term [82]. Ambition to achieve the goals is as important as ever, but the pandemic has required countries to revise their strategies for achieving them. We have to discuss whether the SDGs are deserved to be revised or whether the time point to achieve them needs to be delayed. We should increase the resilience of the goals and set different priorities for different countries.
As COVID-19 batters the world and its economy, it's time to rethink sustainable pathways for the future of human beings. The COVID-19 has irreparably altered at least some of the SDGs' underpinning assumptions-sustained economic growth and globalization. Some scholars believe that it is unlikely there will be enough money or attention to banish poverty and inequality, expand health services and overturn biodiversity loss and climate change, all by 2030 [16,77]. Therefore, we may adjust the path and focus of the next phase of the SDGs' implementation in a post-pandemic era. We suggest five key points to take into account ( Figure 5): integrate SDGs and maximize synergies between goals; set priorities for achieving short-and long-term goals; strengthen global cooperation; assess and predict the progress of the SDGs timely; promote the integration of science, technology, policy and practice (STPP).

Integrating SDGs and Maximize Synergies between Goals
The 17 goals are interrelated, with both negative ("trade-offs") and positive ("cobenefits") [83,84]. The economic, social, and environmental targets in the SDGs are entwined as an "indivisible whole." Understanding how goals influence one another (positively or negatively) and finding the leverage points for sustainability transformations are critical to prioritize and implement policies that maximize synergies between goals while navigating trade-offs [85,86]. Implementing the SDGs requires cross-sectoral processes and systems thinking to foster policy coherence [87]. Some scholars believe that the existing mode of achieving SDGs is at the cost of environmental degradation [88]. The coupling between humans and nature needs to be addressed in most goals [89,90]. For example, combating climate change can reinforce all 17 goals but may undermine efforts to achieve Sustainable Consumption and Production (Goal 12) [91], the trade-off between emission deceleration and economic growth in China [92]. Using coal to improve energy access Affordable and Clean Energy (Goal 7) in Asian countries, for example, would accelerate climate change and acidify the oceans (undermining Climate Action (Goal 13) and Life below Water (Goal 14)), as well as exacerbate other problems, such as health damage from air pollution (i.e., Good Health and Well-being (Goal 3)) [93].
Focusing on a smaller, more integrated set of goals may help reduce the cases in which the implementation of one of the SDGs would impede another. Integrating SDGs is an important move in a post-pandemic era. Even before the COVID-19 pandemic, ideas were floating around about ways to make the goals more achievable, with around five or six targets for each goal [94]. Under one proposal from a group of UN science advisers, the SDGs would be redistributed into six "entry points." These are human well-being (including eliminating poverty and improving health and education), sustainable economies (including reducing inequality), access to food and nutrition, access to and decarbonizing energy, urban development, and the global commons (combining biodiversity and climate change) [95]. The Sustainable Development Solutions Network (SDSN), a related proposal from a different group of advisers, also redistributes the 17 goals into 6, which it calls "transformations." These are education, gender, and inequality; health, well-being, and demography; energy decarburization and sustainable industry; sustainable food, land, water, and oceans; sustainable cities and communities; a digital revolution for sustainable development [79,96]. Some scholars use one key goal to integrate other goals. As production dynamics in every country are highly affected by the pandemic, industrial policy is considered part of the response to solve dramatic economic and social problems derived from extraordinary levels of unemployment, deprivation, and poverty [97]. The sustainability of water cannot be simply considered in terms of supply as it has other environmental dimensions, such as the depletion of the groundwater table, drainage problems, and the pollution of surface water bodies [98]. Focusing on poverty alleviation and reducing inequalities will have compound positive effects on all SDGs [99].
The attainment of the 2030 Agenda will greatly depend on whether the identified synergies among the goals can be leveraged in a post-pandemic era [100,101]. Actions initiated to fulfill individual goals should be coherent across efforts to achieve the full set of the SDGs in the long run [102]. For example, the mitigation strategies for climate change and water and air pollution in the post-COVID-19 era may be integrated [103]. The synergies between the SDGs for urban development, food security, and poverty alleviation in rapidly changing peri-urban areas should be taken into account [104]. The co-benefits of nature's contribution to Clean Water and Sanitation (Goal 6), the protection of forest cover (for SDG target 15.2), carbon storage (Climate Action (Goal 13)) and biodiversity (for SDG target 15.5), should be sustainably managed, given the trade-offs with Zero Hunger (Goal 2) [105].

Set Priorities for Achieving Short-and Long-Term Goals
For sustainable development, coping with the trade-offs of short and long-term outcomes is demanding in a post-pandemic era [106]. Some scholars suggested creating some kind of an addition to the SDGs in the form of a protocol clarifying urgent necessities and priorities during a pandemic and recession [107]. COVID-19 has had a major impact on food availability, equity in health services and education, international cooperation, and other goals [23]. A big challenge of the pandemic is how to balance economic and social activities with epidemic prevention and control. In this regard, we should learn more from China's experience. In 2020, China's GDP grew by 2.3% in real terms, making it the only major economy in the world to achieve positive economic growth, and meanwhile, the pandemic has been effectively controlled. At the same time, the impact of the pandemic presents an opportunity to advance SDGs related to communicable diseases. Some issues became more urgent during the pandemic. For example, 30 of the targets (18%) will help reduce the likelihood of another global pandemic. Reducing trafficking in wildlife and the supply and demand of illegal wildlife products will reduce the likelihood of new viruses being transmitted to humans. Three further goals-achieving universal health coverage, strengthening the health workforce, and enhancing the capacity of the global health risk early warning system will mitigate the knock-on effects of the pandemic in low-income countries. Due to COVID-19, the problems in the cities, which recorded 90% of the re-ported cases, have also become more pressing as urban areas house highly diverse people with differing vulnerabilities [108]. Nearly one-quarter of the world's urban population lives in slums, and the inadequate state of public services in these areas requires urgent attention [109].
In the post-pandemic era, the world may take a holistic and all-encompassing approach with a focus on the overall achievement of SDGs while reformulating the short-term and mid-term policies [110]. We refer to the literature [16,23,73,77] and summarize the impacts of COVID-19 on SDGs, implementation priority, and examples of targets impacted by the pandemic (Table 2). In this summary, we identified eight goals that should be prioritized in the short term, including poverty, hunger, health, education, and inequalities. These short-term issues are put forward referring to the highly negative impacts of COVID-19 on the SDGs [73]. For the goals with mild and moderate impacts, we set the implementation priority by medium-term and long-term, such as biodiversity protection, climate action, and affordable and clean energy [12,111]. Table 2. Impacts of the COVID-19 on SDGs and the implementation priority [16,23,73,77].

SDGs
Impacts of the COVID-19 on SDGs Implementation Priority Example of Targets

Global Cooperation and Multilateralism Remain the Inevitable Choice for SDGs Implementation
COVID-19 has seriously affected the process of globalization. The current crisis, including hostilities among major powers, raises the specter of global conflict instead of global cooperation [73]. Foreign direct investment and global value chains are likely to take a hit from the COVID-19 crisis [23]. Thus, global cooperation is more urgent than ever in the face of a pandemic, especially with regard to the development and distribution of vaccines, food, and anti-epidemic supplies, providing assistance to least developed countries, regional travel quarantine, and virus mechanism research.
The Sustainable Development Report 2020 identifies five key measures for global cooperation: (1) disseminate best practices rapidly; (2) strengthen financing mechanisms for developing countries; (3) address hunger hotspots; (4) ensure social protection; (5) promote new drugs and vaccines [23]. It is necessary to strengthen financing mechanisms for developing countries, considering that they are severely affected by COVID-19. The IMF needs ample firepower, including far greater latitude to extend credits, either under existing facilities or through a new issuance of Special Drawing Rights (SDRs) [73]. LDCs need global support from the lead United Nations agencies, including the Office for the Coordination of Humanitarian Affairs, the Food and Agriculture Organization, and the World Food Program, so that they can head off impending hunger crises and food insecurity [73]. Moreover, the promotion of new drugs and vaccines is imminent. Financing R&D for COVID-19 drugs and vaccines is an urgent global public good. Without global cooperation, R&D will be inadequate and duplicative. There will also be inequality in the distribution of vaccines since many countries cannot afford to make or buy them.
Assessing policy coherence and coordination of sustainable development across countries is essential. Policy Coherence for Development, which is considered a pillar of the 2030 Agenda [112], can link different SDGs when used as a methodology [113]. SDG Target 17.14 calls on all countries to "enhance policy coherence for sustainable development" as a key means of implementation. It requires meaningful collaboration and coordinated action across both policy sectors and different levels of government. It also requires balancing short-term priorities with long-term sustainability objectives and taking into account the impact of domestic policies on global well-being outcomes. Coherence between the development policies of recipients and the providers of development assistance [114], cross-jurisdiction policy coherence, and national coordination should be improved [115].
Regional cooperation is very effective to increase mutual support among regional neighbors. From a policy coherence perspective, a wide range of policy instruments is already in place in the EU to foster synergies, which may have co-benefits. The Forum of the Countries of Latin America and the Caribbean on Sustainable Development provides peer learning opportunities, the exchange of good practices, and the discussion of common goals and seeks to encourage cooperation with regional and subregional organizations to guide an inclusive regional process toward sustainable development in Latin America and the Caribbean [116]. The ASEAN-EU Cooperation Initiative was launched to further strengthen policy dialogue, promote economic and trade connectivity, and support the blueprint for an ASEAN Economic Community. The China-EU 2020 Strategic Agenda for Cooperation is a joint effort to lead the way in improving global resource efficiency and implementing the SDGs. In addition, it is suggested that countries explore regional collaboration around specific goals of SDGs, for example, horizontal ecological compensation mechanism between countries based on the economic, energy, and ecological environment.
Strategies to achieve the SDGs need to be implemented domestically without generating negative impacts on other countries ("spillovers"). The spillover effect covers financial spillovers (e.g., financial secrecy, profit shifting), environmental and social impacts embodied into trade and consumption (e.g., imported CO 2 emissions, imported biodiversity threats, accidents at work embodied into the trade), and security/development cooperation (Official Development Aid, weapons exports) [73]. The SDGs are to pursue the win-win of all humankind rather than the one-win of a certain country. Such telecoupling and hidden coupling between countries are also what we need to take care of in the future [90].
Global climate change and natural disasters are linked to multiple SDGs, for example, Zero Hunger (Goal 2), Clean Water and Sanitation (Goal 6), Decent Work and Economic Growth (Goal 8), Industry, Innovation, and Infrastructure (Goal 9), Sustainable Cities and Communities (Goal 11), Life below Water (Goal 14), and Life on Land (Goal 15) [117]. Thus, global cooperation under different international frameworks, such as the Sendai Framework, the Paris Agreement, and the 2030 Agenda, should be strengthened through joint seminars of three agreed committees including enterprises and government at various levels [118].

Assess and Predict the Progress of the SDGs Timely Based on Big Data
Many countries and institutions have begun to evaluate the process of the SDGs. However, in the face of such an unpredictable event as COVID-19, we need more timely and effective progress assessments of the SDGs for clear and unambiguous messages to be conveyed to users (decision makers and policymakers and also the lay public) [119] and to help adjust policies on time under the impact of a pandemic. We have made a few suggestions as follows.
First, carry out a rapid assessment or real-time monitoring of different SDGs by taking advantage of big data. This includes remote sensing data, network data, population movement data, etc. Since the SDGs were proposed in 2015, SDSN has built the SDGs Index and publishes the annual SDG Index and Dashboards Report every year to evaluate each country's implementation of the SDGs and to create a favorable environment for using the data revolution to promote sustainable development. At present, the UN carries out annual progress reports on a national basis, but many indicators are difficult to obtain. For example, the statistical caliber of the indicators is different in each country. Cross-country comparisons are poor, and the data at the subnational scale (provincial and state scale) are more difficult to obtain. Big data demonstrated to be a powerful tool for epidemic transmission analysis and prevention decision-making support, especially during COVID-19 [120]. Timely, quality, open, and disaggregated data are critical in understanding, managing, and mitigating the human, social, and economic effects of COVID-19 [121]. Big Earth data science is worth developing to provide the methodologies and tools of generating knowledge from diverse, numerous, and complex data sources. Doing so is necessary and essential to ensuring a sustainable human society for the preservation of planet Earth [122,123], for example, evaluating clean water and sanitation and life below the water by using earth observation systems [124], and using population movement data to assess cities' health [125].
Second, increased uncertainty risk assessment in future policymaking will enhance regional development resilience. Decision makers who are implementing and tracking the SDGs may employ probabilistic decision analysis, including uncertainty in predictive models [126], which may strengthen government capacities to anticipate and manage unforeseen disruptive events. An increasing understanding of the need to address the root causes of uncertainty risk has led to calls for greater synergistic coherence between the Sendai Framework, the Paris Agreement, and the SDGs [9,127] as well as strengthened cooperation in fragile areas such as coastal zones, arid areas, and urban agglomerations "critical transition zone" (e.g., peri-urban and forest margin areas in the Global South) [128]. Special attention should be paid to telecoupling and lag coupling between man and nature, to facilitate risk assessment and identify the early warnings of climate change, major health events, and natural disasters [90]. Urban resilience is increasingly considered essential to managing the risks and challenges arising in a globally changing, connected, and urbanized world [129]. If cities are built or restructured to realize the SDGs, we will stand a much higher chance of coping more effectively with the next pandemic [130].

Promote the Integration of Science, Technology, Policy, and Practice (STPP)
It is very important to push the boundaries of science, technology, policy, and practice reflection forward, and toward an integrated implementation of the SDGs [131][132][133]. However, this integration in many countries is difficult; for example, researchers, policymakers, and practitioners have multiple, often conflicting yet poorly documented priorities on how agriculture could or should support achieving the SDGs [134], which have led to disastrous outcomes for public health, the economy, and international collaboration [135]. There is often a serious lack of consideration of the adoption of systems thinking and integrated analytical approaches and models in policymaking [71]. Government should play a major role in advancing the integration of STPP. Researchers in sustainability science and other disciplines could work together to solve problems and strengthen the science-policy-society interface, providing policymakers information they can use to solve development problems by using scenario modeling tools [95,136]. All kinds of emerging technologies (e.g., ICT, renewable energy, biotechnology, artificial intelligence) are having a powerful impact on SDGs, and the government plays an important role in them [137]. Of the 169 SDG targets, 103 are directly influenced by digital technologies [138], which has the potential to open up new employment opportunities for the poor and solve challenges such as the nation's aging workforce and global pollution [139]. Meanwhile, the positive and negative effects of artificial intelligence and the digital economy in achieving the SDGs should be discussed sufficiently [140,141].
Although networks across the boundaries of science-technology-policy-practice are still in their infancy, deeper collaborations and dialogues between scientists, the government, and the public are also quite important [142]. Some scholars identify three key governance challenges that are central for implementing the SDGs: cultivating collective action by creating inclusive decision spaces for stakeholder interaction across multiple sectors and scales; making difficult trade-offs, focusing on equity, justice, and fairness; and ensuring mechanisms exist to hold societal actors to account regarding decision making, investment, action, and outcomes [143]. Balancing the conflicts of interest among different groups and improving SDGs literacy and education to modify social norms and behaviors is what we should accomplish in the future [144]. Large-scale comparative data and measurable indicators are hence required in the impact assessment of policy interventions to identify whether policies are working and how to improve [145]. This calls for joint efforts and inputs of multiple stakeholders by combining technocratic and bottom-up knowledge from proactive and conscious individuals and collectives through context-specific social networks [146].

Data Availability Statement:
Publicly available datasets were analyzed in this study. This data can be found here: www.sdgindex.org (accessed on 25 May 2021).

Conflicts of Interest:
The authors declare no conflict of interest.