Carbon Footprint Evaluation of the Business Event Sector in Japan

The business event sector expects large economic impact as MICE (Meeting (M), Incentive Travel (I), Convention (C), and Exhibition and Event (E)). Some guidelines for MICE sustainability include the requirement for carbon management (carbon neutral, measurement of greenhouse gas emissions, carbon offset, etc.) as a positive contribution to mitigating climate change. According to the environmental guidelines for events updated by the Japanese Ministry of the Environment in 2019, goods should be procured after considering the environmental load items and life cycle stages from the life cycle assessment (LCA) perspective. In this study, we evaluated the business events sector, not only transportation but also accommodation of participants from overseas, as well as food and beverages, souvenirs and shopping, and entertainment and tourism expenses. These items were not included in the previous existing case studies. We evaluated the carbon footprint (CFP), calculated from consumption information using input-output analysis. In this study, the total CFP was 804.8 t-CO2eq (M, I, C-ICCA (Convention based on an international conference standard from the International Congress and Convention Association (ICCA)), and E) and transportation (Transp, 56.0%) contributed the most, followed by planning and preparation (Plan, 13.2%) and accommodation (Acc, 12.0%), souvenirs, shopping, entertainment and sightseeing (SE, 10.1%), and food and beverages (FB, 7.9%). In the case of M, I, C-JNTO (Convention based on an international conference standard from the Japan National Tourism Organization (JNTO)) and E, the total CFP was 1714.4 t-CO2eq and transportation (Transp, 54.3%) contributed the most, followed by planning and preparation (Plan, 14.3%) and accommodation (Acc, 12.9%), food and beverages (FB, 9.2%), and souvenirs, shopping, entertainment and sightseeing (SE, 8.2%). From this result, the CFP of this sector was found to be due to transportation, planning and preparation, accommodation, food and beverages, and souvenirs. Sustainability guidelines recommend that organizers procure products that contribute to lower CFP, and it is considered good practice to provide participants with such product and service choices. The providers themselves also need action to offer low CFP products. Assessing changes in consumption items in future studies may help to calculate environmental impacts and sustainability.


Social Background
The United Nations (UN) designated 2017 as the International Year of Sustainable Tourism for Development [1]. Sustainable tourism is defined as "tourism that fully addresses the current, (1) M: The number of participants is 10 or more, use of external facilities (hotels, MICE facilities, etc.), held for more than four hours, and including overseas participants; (2) I: Ten or more participants, use of external facilities (hotels, MICE facilities, factories, tourist facilities, etc.), held for more than four hours, and participants arrive from overseas for events in Japan; (3) C-ICCA: A standard international conference per the International Congress and Convention Association (ICCA), an international conference that rotates through more than three countries, the number of participants is 50 or more, and held regularly; (4) C-JNTO: A standard international conference per the Japan National Tourism Organization (JNTO). International organizations (including branch offices in each country), or national organizations and domestic organizations (not including private companies) with more than 50 participants is 50, participants from more than three countries including Japan, and held for a period of one day or more; and (5) E: Among domestic exhibition events, the ratio of overseas participants and exhibitors is high, an event certified as an international exhibition. Table 1 shows the system boundaries of this study. The stakeholders included organizers, exhibitors, and participants. Itsubo et al. [33] included the venue as a stakeholder within the system boundaries. In this study, items related to the venue were included in each item. For example, part of the venue usage in M and I were included in planning and management. The cost of using electricity, gas, and water was included in this item. Decoration and construction, equipment rental, and extraordinary personnel required for preparation at the venue were also included, as were shipping, printing, promotion, and advertisement necessary for preparation. Transportation (international transport (flight) and domestic transport (flight, train, bus, taxi, gasoline etc.)), accommodation, and food and beverages were included in all stakeholders. Also included were souvenirs, shopping costs, and tourism Sustainability 2020, 12, 5001 4 of 24 and entertainment costs that participants would pay for their stay at the destination. Participants were separated into domestic and overseas. The existing studies did not include participants' food and beverages or organizer planning costs and did not divide the participants into domestic and overseas. We included these factors in our study.  Table 2 shows the results of consumption amounts for organizers, exhibitors, domestic participants, and overseas participants [37,38]. The scope of evaluation in this study is shown in Table 2. More details concerning consumption are listed in Appendix A, Table A1. The amount of consumption in M occurred in the following order: accommodation, domestic transport, food and beverages, planning and management of meetings and events, and parties paid for by the organizer. Souvenirs and shopping and food and beverages by overseas participants also contributed. The amount of consumption in I was in the following order: international transport, accommodation, domestic transport, food and beverages that the organizer paid for. Souvenirs and shopping, food and beverages, and entertainment and tourism paid for by overseas participants also contributed. The organizer paid for international transportation for the participants of M and I. We assumed that participants did not pay for these items. The amount of consumption in C-ICCA occurred in the following order: conference decoration and construction paid for by organizer; conference decoration and construction, equipment rental, promotion and advertisement paid for by exhibitors; international flights paid for by overseas participants; and accommodation. C-JNTO consumed the following in large amounts: conference decoration and construction; venue usage by organizer; accommodation and train transport, paid for by domestic participants; and international flights, paid for by overseas participants. The amount of consumption in E occurred in the following order: parties, such as post-convention parties held by the organizer; conference decoration and construction paid for by exhibitors; train transport paid for by domestic participants; and international flights and accommodation, paid for by overseas participants.
This survey included non-transport assessments. Extensive research is required to evaluate individual events. However, public statistical data were used here. By using input-output analysis (input-output LCA), which is often used in LCA evaluation, we evaluated the supply chain.
Similar data were applied to domestic participants because only overseas participants' consumption information was available. According to the Japan Tourism Agency (JTA) report [37,38], domestic participants (DP) did not include participants in the events surveyed. Therefore, OP was information only. In case of C-ICCA and C-JNTO, organizer and exhibitor informations were not available in the JTA report, so the percentage was applied referencing the U.K. report [6].

CFP Calculation
In this study, the Japanese input-output table was used. The principles of this method are based on the work by Leontief [39] and are often used in the LCA research field. The formula used in this method is: where d is the direct environmental loads and the environmental loads per production value, (I − A) −1 is the Leontief inverse matrix that can be used to consider the direct and indirect economic ripple effects caused by the consumption of one type of goods, and f is the amount of activity. This method helps to evaluate the entire supply chain. We calculated the CFP using the input-output LCA. The calculation formula is: where di is the direct GHG emission intensity provided for each sector by the Inventory Database for Environmental Analysis version 2 (IDEAv.2), as developed by the National Institute of Advanced Industrial Science and Technology (AIST) [40]; A is the direct input coefficient matrix. We used the 2011 waste input-output table (WIO) developed by Kondo et al. (2019) [41] to provide a broad overview. I is an identity matrix and f i is the amount of activity obtained from the statistics of the JTA [37,38], as detailed previously. Using data focusing on the same year would have been more effective; however, the last waste input-output table available focused only on 2011. DEi is the direct emission from fuel combustion added to the calculation to cover the full cradle-to-grave aspects of products and services; k indicates the number of event categories to be evaluated, which was M, I, C, and E in this study. Using this equation, the calculation was extended from cradle-to-gate to cradle-to-grave. Using these calculations, Kitamura et al. [42] calculated CFP for tourism in Japan. Based on this result, we compiled a list of GHG emissions of tourism products and services (Appendix A, Table A2). According to the JTA's report, the total consumption in Japan's MICE sector was about 150.58 billion yen (ICCA standard) and about 323.97 billion yen (JNTO standard) [37,38], because the scale of events differs between the ICCA and the JNTO standards. The detailed consumption amount breakdown is shown in Table A1. These data were summarized using a survey method as follows: M (meeting): a questionnaire survey was administered to agents handling corporate meetings. The consumption amount was estimated from the questionnaires administered to the organizers and participants. We collected 456 responses, and the share of handling agents was 73% (72 samples); I (incentive travel): A survey was administered to agents and participants dealing with rewards and training trips. From this, the consumption amounts of the organizer and participants were estimated. We collected 706 responses, and the share of handling agents was 73% (71 samples); C (conventions per ICCA and JNTO standards): The number of events covered by the survey was 429 (2016) by the ICCA standard and 3114 events (2016) by the JNTO standard [43]. Samples were collected by administering an interview-type questionnaire survey for participants, an oral questionnaire for organizers, a fill-in questionnaire survey for industry groups, and a mailed questionnaire survey for exhibitors. For the participants, we administered an interview-type questionnaire at the international conference (17 events) and mailed Sustainability 2020, 12, 5001 6 of 24 questionnaire for exhibitors (228 samples). After conducting the interview-type questionnaire survey, the collected samples were analyzed and the consumption amount per participant was calculated; E (exhibition and event): At exhibitions and events, the total consumption was estimated by calculating the amounts of consumption by the organizer, exhibitors, and participants. We collected 39 responses.
However, some information was missing. Therefore, we chose to supplement our data with data from similar countries. First, we confirmed the economic scale of the MICE sector. Direct spending rankings in the top 50 countries in the business event sector [44] showed that Japan has a similar economic scale to the U.K. [6] compared to other countries. Then, based on these U.K. data, the breakdown of direct spending by the organizer and exhibitor was checked against the JTA data. Part of the data were aggregated and totaled. For the exhibitor information, we paid attention to floor space rental. According to the JTA report, floor space rental is the organizer's income, and the organizer spends more than the budget including it, so it was not counted to avoid double counting. Table A3 shows how the coefficients were applied to consumption and expenditure items.

CFP of MICE
The calculation results of CFP are shown here. Figure 1 shows the CFP in each category. Total emissions were 804. In the case of Figure 1a, transportation (Transp, 56.0%) contributed the most, followed by planning and preparation (Plan, 13.2%), and accommodation (Acc, 12.0%), souvenirs, shopping, entertainment and sightseeing (SE, 10.1%), and food and beverages (FB, 7.9%). In the case of Figure 1b, transportation (Transp, 54.3%) contributed the most, followed by planning and preparation (Plan, 14.3%) and accommodation (Acc, 12.9%), food and beverages (FB, 9.2%), and souvenirs, shopping, entertainment and sightseeing (SE, 8.2%). In both cases, (Figure 1a,b), Transp contributed the most, followed by Plan and Acc. In Figure 1a,b, the highest contribution of Transp in all categories occurred due to the volume of evaluated events. From this result, the CFP of the MICE sector is produced not only by transportation but also planning and preparation, accommodation, food and beverages, and souvenirs.  Table A4.   accommodation, (DP) domestic flights, and (OP) souvenirs and shopping. In C-JNTO, contributions were made in the following order: (OP) international flights, (DP) domestic flights, (DP) accommodation, (O) transportation to venue, and (O) food and beverages. In E, contributions were made in the following order: (OP) international flights, (DP) domestic flights, (E) shipping, (E) conference decoration and construction, and (DP) train. The detailed consumption items and the CFP are listed in Table A4.   Figure 3 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/participants) in Meeting (M). The right side of the horizontal axis shows the amount it contributes to the consumption. Similarly, the higher the point on the vertical axis, the greater the amount contributed to the CFP. According to these results ( Figure  3a), the contribution by the organizers to transportation, accommodation, and food and beverage is large. Both domestic and overseas participants make a large contribution to souvenirs and shopping,   Figure 3 shows the relationship between the CFP (kg CO 2 eq) and consumption amount (JPY) for each inventory item by group (organizer/participants) in Meeting (M). The right side of the horizontal axis shows the amount it contributes to the consumption. Similarly, the higher the point on the vertical axis, the greater the amount contributed to the CFP. According to these results (Figure 3a), the contribution by the organizers to transportation, accommodation, and food and beverage is large. Both domestic and overseas participants make a large contribution to souvenirs and shopping, food and beverages, and transportation (Figure 3b,c). Compared to other MICE events, the domestic transport of organizers, accommodation, and food and beverages are characteristic.  Figure 4 shows the relationship between the CFP (kg CO 2 eq) and consumption amount (JPY) for each inventory item by group (organizer/overseas participant) in incentive travel (I). According to these results (Figure 4a), the organizers largely contribute to transportation. Overseas participants provide a large contribution to transportation, souvenirs and shopping, and food and beverages ( Figure 4b).

Incentive Travel
The slope of the regression line is large compared to the other MICE events. This is produced by the international transport of organizers. However, this is included in most cases due to the organizations' expenditure on the international transportation of the participants.   Figure 4 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/overseas participant) in incentive travel (I). According to these results (Figure 4a), the organizers largely contribute to transportation. Overseas participants provide a large contribution to transportation, souvenirs and shopping, and food and beverages ( Figure 4b). The slope of the regression line is large compared to the other MICE events. This is produced by the international transport of organizers. However, this is included in most cases due to the organizations' expenditure on the international transportation of the participants.   Figure 5 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) per the ICCA Standard (C). According to these results (Figure 5a), the organizers provide a large contribution to transportation, food and beverages (for participants), accommodation, conference decoration and construction, and venue usage. The exhibitors provide a large contribution to shipping, promotion and advertisement, equipment rental, conference decoration and construction, and others ( Figure 5b). Both domestic and overseas participants provide a large contribution to transportation, accommodation, food and beverages, and souvenirs and shopping (Figure 5c,d). Compared to other MICE events, the flights and accommodations of overseas participants and the shipping of exhibitors are the characteristics for this group.  Figure 5 shows the relationship between the CFP (kg CO 2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) per the ICCA Standard (C). According to these results (Figure 5a), the organizers provide a large contribution to transportation, food and beverages (for participants), accommodation, conference decoration and construction, and venue usage. The exhibitors provide a large contribution to shipping, promotion and advertisement, equipment rental, conference decoration and construction, and others ( Figure 5b). Both domestic and overseas participants provide a large contribution to transportation, accommodation, food and beverages, and souvenirs and shopping (Figure 5c,d). Compared to other MICE events, the flights and accommodations of overseas participants and the shipping of exhibitors are the characteristics for this group.

Convention (ICCA Standard)
Sustainability 2020, 12, x FOR PEER REVIEW 10 of 26 Figure 4 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/overseas participant) in incentive travel (I). According to these results (Figure 4a), the organizers largely contribute to transportation. Overseas participants provide a large contribution to transportation, souvenirs and shopping, and food and beverages (Figure 4b). The slope of the regression line is large compared to the other MICE events. This is produced by the international transport of organizers. However, this is included in most cases due to the organizations' expenditure on the international transportation of the participants.   Figure 5 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) per the ICCA Standard (C). According to these results (Figure 5a), the organizers provide a large contribution to transportation, food and beverages (for participants), accommodation, conference decoration and construction, and venue usage. The exhibitors provide a large contribution to shipping, promotion and advertisement, equipment rental, conference decoration and construction, and others ( Figure 5b). Both domestic and overseas participants provide a large contribution to transportation, accommodation, food and beverages, and souvenirs and shopping (Figure 5c,d). Compared to other MICE events, the flights and accommodations of overseas participants and the shipping of exhibitors are the characteristics for this group.  Figure 6 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) per the JNTO Standard (C). According to these results, the organizers make a large contribution to transportation, accommodation, and food and beverages for participants, conference decoration and construction, and venue usage (Figure 6a). The exhibitors make a large contribution to shipping, promotion and advertisement, equipment rental, conference decoration and construction, and others ( Figure 6b). Both domestic and overseas participants largely contribute to transportation, accommodation, food and beverages, and souvenirs and shopping (Figure 6c,d). Compared to other MICE events, the flight, accommodation, and food and beverages of domestic and overseas participants are characteristic of this group.  Figure 6 shows the relationship between the CFP (kg CO 2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) per the JNTO Standard (C). According to these results, the organizers make a large contribution to transportation, accommodation, and food and beverages for participants, conference decoration and construction, and venue usage (Figure 6a). The exhibitors make a large contribution to shipping, promotion and advertisement, equipment rental, conference decoration and construction, and others (Figure 6b). Both domestic and overseas participants largely contribute to transportation, accommodation, food and beverages, and souvenirs and shopping (Figure 6c,d). Compared to other MICE events, the flight, accommodation, and food and beverages of domestic and overseas participants are characteristic of this group.  Figure 6 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) per the JNTO Standard (C). According to these results, the organizers make a large contribution to transportation, accommodation, and food and beverages for participants, conference decoration and construction, and venue usage (Figure 6a). The exhibitors make a large contribution to shipping, promotion and advertisement, equipment rental, conference decoration and construction, and others (Figure 6b). Both domestic and overseas participants largely contribute to transportation, accommodation, food and beverages, and souvenirs and shopping (Figure 6c,d). Compared to other MICE events, the flight, accommodation, and food and beverages of domestic and overseas participants are characteristic of this group.  Figure 7 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) for Exhibitions and Events (E). According to these results, the organizers largely contribute to parties like those held post-convention, conference decoration and construction, venue usage, and printing (Figure 7a). The exhibitors contribute to shipping, conference decoration and construction, transportation, and printing, and domestic participants contribute to transportation, food and beverages, and accommodation (Figure 7b). Domestic participants make a large contribution to transportation, food and beverages, accommodation (Figure 7c). Overseas participants make a large contribution to transportation, accommodation, entertainment and tourism, food and beverages, and souvenirs and shopping (Figure 7d). Compared to other MICE events, the flights, accommodation, and food and beverages of domestic and overseas participants characterize this group, which also includes trains taken by domestic participants, decoration and construction, and shipping paid for by exhibitors.  Figure 7 shows the relationship between the CFP (kg CO 2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) for Exhibitions and Events (E). According to these results, the organizers largely contribute to parties like those held post-convention, conference decoration and construction, venue usage, and printing (Figure 7a). The exhibitors contribute to shipping, conference decoration and construction, transportation, and printing, and domestic participants contribute to transportation, food and beverages, and accommodation (Figure 7b). Domestic participants make a large contribution to transportation, food and beverages, accommodation (Figure 7c). Overseas participants make a large contribution to transportation, accommodation, entertainment and tourism, food and beverages, and souvenirs and shopping (Figure 7d). Compared to other MICE events, the flights, accommodation, and food and beverages of domestic and overseas participants characterize this group, which also includes trains taken by domestic participants, decoration and construction, and shipping paid for by exhibitors.  Figure 7 shows the relationship between the CFP (kg CO2 eq) and consumption amount (JPY) for each inventory item by group (organizer/exhibitor) for Exhibitions and Events (E). According to these results, the organizers largely contribute to parties like those held post-convention, conference decoration and construction, venue usage, and printing (Figure 7a). The exhibitors contribute to shipping, conference decoration and construction, transportation, and printing, and domestic participants contribute to transportation, food and beverages, and accommodation (Figure 7b). Domestic participants make a large contribution to transportation, food and beverages, accommodation (Figure 7c). Overseas participants make a large contribution to transportation, accommodation, entertainment and tourism, food and beverages, and souvenirs and shopping (Figure 7d). Compared to other MICE events, the flights, accommodation, and food and beverages of domestic and overseas participants characterize this group, which also includes trains taken by domestic participants, decoration and construction, and shipping paid for by exhibitors.  Figure 8 compares the results in this study with those of existing research. Only a few case studies evaluated MICE as business tourism in Japan. In MICE, carbon offset is often adopted as carbon management. This study and the three existing case studies adopted the life cycle approach. Tokyo City University-Itsubo Laboratory (2009a, 2009b) [35] was a convention and Itsubo et al. [33] was an exhibition/event (E). Itsubo Laboratory (2009a) [35] was a convention (C) organized by the same organizer, Itsubo Laboratory (2009b) [35], but the hosting area and location were different. The venue was an exhibition facility and many participants needed to use domestic flights. In addition, accommodation was also included. Itsubo Laboratory (2009b) [35] is an example of a meeting held in a place which was easy to access by a relatively large number of participants. The venue was rented from a university campus facility. However, these two cases did not include participants' food and beverages and planning costs. In this case, the increase or decrease in environmental load can be found by selecting the venue especially given the influence by the transportation of the participants. The results of this study (C-ICCA, C-JNTO) are above the regression line. This indicates the characteristics of consumption, including the transportation of domestic and overseas participants. The participants' accommodation also contributed to the organizers' planning costs.

Comparison with Existing Studies
Itsubo et al. [33] evaluated the largest environmental exhibition in Japan. The scale of the event was close to that of the present study, but the percentage of overseas participants was low. The breakdown of domestic and overseas participants was not shown. In this case, most participants were domestic, and the transportation of overseas participants was not included. We covered events with many overseas participants, including transportation. The environmental load per participant is likely to be lower than that of other MICE events.
Kitamura et al. [42], in a Japan case, evaluated "a; inbound tourism, b; overnight stay of domestic tourism, c; day trip of domestic tourism, d; outbound tourism". This case included the products' consumption by participants in business events, but not that by the organizers of each event. Here, we included organizers and exhibitors as well as participants. The cases of "a" and "d" were above the regression line. This showed the contribution of international flights to the total CFP. It is also important to choose a location that travelers can easily access.  Figure 8 compares the results in this study with those of existing research. Only a few case studies evaluated MICE as business tourism in Japan. In MICE, carbon offset is often adopted as carbon management. This study and the three existing case studies adopted the life cycle approach. Tokyo City University-Itsubo Laboratory (2009a, 2009b) [35] was a convention and Itsubo et al. [33] was an exhibition/event (E). Itsubo Laboratory (2009a) [35] was a convention (C) organized by the same organizer, Itsubo Laboratory (2009b) [35], but the hosting area and location were different. The venue was an exhibition facility and many participants needed to use domestic flights. In addition, accommodation was also included. Itsubo Laboratory (2009b) [35] is an example of a meeting held in a place which was easy to access by a relatively large number of participants. The venue was rented from a university campus facility. However, these two cases did not include participants' food and beverages and planning costs. In this case, the increase or decrease in environmental load can be found by selecting the venue especially given the influence by the transportation of the participants. The results of this study (C-ICCA, C-JNTO) are above the regression line. This indicates the characteristics of consumption, including the transportation of domestic and overseas participants. The participants' accommodation also contributed to the organizers' planning costs.

Comparison with Existing Studies
Itsubo et al. [33] evaluated the largest environmental exhibition in Japan. The scale of the event was close to that of the present study, but the percentage of overseas participants was low. The breakdown of domestic and overseas participants was not shown. In this case, most participants were domestic, and the transportation of overseas participants was not included. We covered events with many overseas participants, including transportation. The environmental load per participant is likely to be lower than that of other MICE events.
Kitamura et al. [42], in a Japan case, evaluated "a; inbound tourism, b; overnight stay of domestic tourism, c; day trip of domestic tourism, d; outbound tourism". This case included the products' consumption by participants in business events, but not that by the organizers of each event. Here, we included organizers and exhibitors as well as participants. The cases of "a" and "d" were above the regression line. This showed the contribution of international flights to the total CFP. It is also important to choose a location that travelers can easily access.
Kitamura et al. [42], in a Japan case, evaluated "a; inbound tourism, b; overnight stay of domestic tourism, c; day trip of domestic tourism, d; outbound tourism". This case included the products' consumption by participants in business events, but not that by the organizers of each event. Here, we included organizers and exhibitors as well as participants. The cases of "a" and "d" were above the regression line. This showed the contribution of international flights to the total CFP. It is also important to choose a location that travelers can easily access.  . If the point is on the right side, the economic effect is high. The y-axis shows the CFP amount. The higher the point, the greater the contribution to the environmental load. Within the MICE sector, C-ICCA produces a low environmental load with respect to economic effects. Conversely, incentive travel has a high environmental impact with respect to economic effects. The Japanese government is particularly increasing invitations for internationals to attend conferences [45,46]. For this reason, a balance must be achieved between economic effect and environmental load. We determined CFP for the MICE sector, which is expected to increase given the government's strategy to economically expand [3,4].  . If the point is on the right side, the economic effect is high. The y-axis shows the CFP amount. The higher the point, the greater the contribution to the environmental load. Within the MICE sector, C-ICCA produces a low environmental load with respect to economic effects. Conversely, incentive travel has a high environmental impact with respect to economic effects. The Japanese government is particularly increasing invitations for internationals to attend conferences [45,46]. For this reason, a balance must be achieved between economic effect and environmental load. We determined CFP for the MICE sector, which is expected to increase given the government's strategy to economically expand [3,4].

Toward the Sustainability of the MICE Sector
Some measures could be taken to reduce the CFP of MICE events. For example, MICE venues could be located near international airports to reduce the burden of transportation. For instance, a new MICE facility was built at New Chitose International Airport in Hokkaido, Northern Japan [47].

Toward the Sustainability of the MICE Sector
Some measures could be taken to reduce the CFP of MICE events. For example, MICE venues could be located near international airports to reduce the burden of transportation. For instance, a new MICE facility was built at New Chitose International Airport in Hokkaido, Northern Japan [47]. This facility is directly connected to the arrival lobby of the international passenger terminal building. For the organizers, no travel is required from the major transportation hubs to the MICE facility. In the case of food and beverages, the organizer often offers some local food. However, the organizers provide many national and non-local food menus to the participants, which could increase the environmental burden due to the transportation to the MICE site. Several projects of Japanese companies support sustainable transportation. Toyota's project, for example, achieves zero emission of freight transportation by using fuel cell (FC) technology [48]. Hino's project is transportation by joint consolidation to improve logistics [49]. A compact city that uses such a transportation method would be an example of a good location to host MICE events, which helps stakeholders at the destination of the MICE event to adopt low-carbon efforts.
Incentive travel has an especially high environmental impact with respect to economic effects. For example, organizers need to choose low-carbon transportation. Participants need to choose low carbon for transportation, souvenirs and shopping, and food and beverages. This measure also applies to meetings. At exhibitions, events, and conventions, greater attention could be paid to participant and exhibitor shipping, decoration and construction, and printing. Tinnish et al. [50] advocated important factors for a successful sustainable MICE event. Organizations should have a strategic focus on sustainability in their planning process and encourage changes in sustainability integration behavior into their products. Specifically, planners should procure environmentally friendly products and products that have received standards or certification. Next, online communication methods and digital signage should be used wherever possible, with minimal printing, and responsible selection. Participation in a donation program supported by the venue, convention bureau, etc., should be encouraged to support school programs and divert conference supplies. Other options include donating timber products from the exhibit, reusing name badges, and using recycled name badges. These actions are included in each sustainability guideline for MICE events to meet as many standards as possible to ensure more sustainable action at each MICE event.
Some of these good practices are included in sustainability guidelines developed in each country or city. It is necessary for product and service providers to further reduce their own CFP efforts, and it is important that participants can select those products and services.

Limitations and Future Investigations
Process-based LCA can reflect the reduction in the consumed physical quantities of resources. However, time and effort are required to review the supply chain. There, we adopted input-output LCA based on consumption. In this study, the boundary was expanded and evaluated more than the existing study. However, some items require more detailed classification. For conventions, reference values were used for the breakdown of organizers and exhibitors.
For future research, the boundary can be expanded to evaluate other sectors related to tourism (sports tourism, medical and health tourism, etc.). In addition, small-and medium-sized events not included in MICE can be evaluated individually. To get additional details, you need to implement a process based LCA, and it is partially recommended to use the amount spent and secondary data from the input-output LCA. We think the details should be evaluated using such a hybrid approach.

Conclusions
In these results, total emissions were 804.8 t-CO2eq (M, I, C-ICCA, and E) and 1714.4 t-CO2eq (M, I, C-JNTO, and E). In the case of M, I, C-ICCA, and E, transportation (Transp, 56.0%) contributed the most, followed by planning and preparation (Plan, 13.2%) and accommodation (Acc, 12.0%), souvenirs, shopping, entertainment and sightseeing (SE, 10.1%), and food and beverages (FB, 7.9%). In the case of M, I, C-JNTO, and E, transportation (Transp, 54.3%) contributed the most, followed by planning and preparation (Plan, 14.3%) and accommodation (Acc, 12.9%), food and beverages (FB, 9.2%), and souvenirs, shopping, entertainment and sightseeing (SE, 8.2%). In both cases, Transp contributed the most, followed by Plan and Acc. The highest contribution of Transp in all categories occurred due to the volume of evaluated events. From this result, the CFP of the MICE sector is produced not only by transportation but also planning and preparation, accommodation, food and beverages, and souvenirs. In this study, we used government statistical data as activity data. The potential environmental impact of medium-scale business conventions was determined. We found that it is possible to calculate the carbon footprint (CFP) of MICE events using joint consumption information and input-output LCA. Incentive travel has a high environmental impact with respect to economic effects. For example, organizers need to choose low-carbon transportation and participants need to choose low carbon or transportation, souvenirs and shopping, and food and beverages. Conventions (ICCA standard) have a low environmental impact with respect to economic effects. Therefore, attracting international conferences is an effective strategy to expand the MICE sector. From the results of this study, in the MICE sector, the contribution of CFP is not limited to the transportation of participants. Procurement of organizers and exhibitors, transportation of staff, and accommodation are also important. Participants need to be aware of the impacts of their activities during the participation period (food and beverages, accommodation, shopping and sightseeing, etc.). For example, organizers source products that contribute to low carbon, and it is considered good practice to serve participants. It takes a lot of staff to get a lot of information for carbon management. However, in recent years, the problem has been cleared in order to analyze the economic effect. It was shown that it is possible to apply the consumption information to the CFP calculation, as in this study. Evaluating changes in consumption items with future research could be useful for calculating environmental impacts and sustainability.