Is Technical E ﬃ ciency A ﬀ ected by Farmers’ Preference for Mitigation and Adaptation Actions against Climate Change? A Case Study in Northwest Mexico

: Climate change has adverse e ﬀ ects on agriculture, decreasing crop quality and productivity. This makes it necessary to implement adaptation and mitigation strategies that contribute to the maintenance of technical e ﬃ ciency (TE). This study analyzed the relationship of TE with farmers’ mitigation and adaptation action preferences, their risk and environmental attitudes, and their perception of climate change. Through the stochastic frontier method, TE levels were estimated for 370 farmers in Northwest Mexico. The results showed the average e ﬃ ciency levels (57%) for three identiﬁed groups of farmers: High TE (15% of farmers), average TE (72%), and low TE (13%). Our results showed a relationship between two of the preferred adaptation actions against climate change estimated using the analytical hierarchy process (AHP) method. The most e ﬃ cient farmers preferred “change crops,” while less e ﬃ cient farmers preferred “invest in irrigation infrastructure.” The anthropocentric environmental attitude inferred from the New Ecological Paradigm (NEP) scale was related to the level of TE. E ﬃ cient farmers were those with an anthropocentric environmental attitude, compared to less e ﬃ cient farmers, who exhibited an ecocentric attitude. The climate change issues were more perceived by moderately e ﬃ cient farmers. These ﬁndings set out a roadmap for policy-makers to face climate change at the regional level.


Introduction and Objectives
For a growing number of researchers and policy-makers, the sustainable development of present and future societies, depends on paying immediate attention to the environmental problems related to climate change [1,2]. The uncertainty of changes generated by this phenomenon exposes the environment to high vulnerability [3]. Article 1 of the United Nations Framework Convention on Climate Change (UNFCCC) states that climate change is "attributed directly or indirectly to human activity that alters the composition of the global atmosphere and that adds to the natural variability of the climate observed during comparable periods of time" [4]. There are different strategies to address the adverse effects and impacts of climate change, and these can be realized by adopting two related adverse effects of climate change as well as farmers' characteristics and crops production systems. The results of this study provide evidence that support the idea that farmers' preferences for the adaptation and mitigation actions against climate change is related to their technical efficiency. These preferences' patterns can provide the decision makers with valuable information that allow them to identify effective policy measures replicable in other similar farming systems.

Description of the Study Area
Irrigation District DR076, Valle del Carrizo, is located in the state of Sinaloa, Mexico, bordered on the north by the state of Sonora, on the south by the Sierra Madre Occidental, and on the west by the Gulf of California. Its geographic location is at latitude 26°05' north and longitude 108°53' west, including part of the municipalities of Ahome and El Fuerte [23]. Its main economic activity is crop and livestock production; cereals such as wheat and corn are the most important crops, at 76% and 8% of total cultivated area, respectively [24]. The DR076 irrigation district is characterized by an extreme climate, in which atypical conditions have been highlighted in recent years, with high levels of precipitation in short periods of time as well as low temperatures [25]. This has repercussions on the technical efficiency of crop production and represents a threat to the food security of the region and the country [26].

Survey Data
This study reports on the findings of a survey carried out with 370 agricultural producers from DR076, whose sample size was determined based on the formula of finite populations, with a confidence level of 95% and a confidence interval of 4.99% [27]. The survey was designed with an interdisciplinary perspective, including economic, social, and demographic aspects. It included a wide set of questions grouped according to the farmers' socioeconomic characteristics, characteristics of their agricultural land and the types of crops [28], and their preference regarding the implementation of mitigation or adaptation actions related to reducing the effects of climate change using the AHP technique. Farmers' attitudes and opinions that define their behavior toward the environment were also determined using the NEP scale. Furthermore, their stated attitude about risk and perception of climate change-related impacts were identified (see Figure 1). The survey was administered by undergraduate students of the Intercultural Autonomous University of Sinaloa and was conducted from October to December 2017. The questionnaire was approved by the ethics committee of the Intercultural Autonomous University of Sinaloa and was conducted according to ethical principles in social science, with specific care taken to protect personal information according to national regulations. Before the survey was conducted, farmers signed a consent form and received an explanation of the questionnaire.

Technical Efficiency
The parametric stochastic production frontier (SPF) was used to estimate the technical efficiency (TE) scores. This approach was simultaneously proposed by Aigner et al. (1977) and Meeusen and Van den Broeck (1977) [29,30]. The SPF model can be specified as The dependent variable (Y i ) is expressed in currency units, Mexican pesos (Mex$), and represents the total farm income. Among the inputs considered as explanatory variables is the total land devoted to crop production (X 1 ), measured in hectares. Total labor inputs (X 2 ) is composed of family and hired labor, representing the number of employees on the farm. (X 3 ) defines expenditure on seeds, expressed in Mex$. Chemical inputs (X 4 ) aggregates the value of fertilizers and crop-protection products used in the production process. Farming overhead (X 5 ) includes irrigation, energy, fuel, and other expenses and is also measured in monetary units.
Using these variables, TE scores were computed as an output-oriented measure and defined as the ratio of observed output to the corresponding SFP, with values in the range of zero to one [31]. According to the estimated TE values, farmers were grouped into three groups, taking account of the mean and one unit upward and downward standard deviation to establish farmers with low, medium, and high efficiency.

Farmers' Preferences for Climate Change Mitigation and Adaptation Actions
Taking a multicriteria approach to decision-making problems, farmers' preferences for different climate change adaptation and mitigation actions were identified using the analytical hierarchy process (AHP). This technique is widely used in the resolution of problems of an agrarian and environmental nature [32]. The AHP was developed by Saaty in the 1970s [33]. This tool has a mathematical approach that breaks down any problem into parts or clusters and analyzes them in a hierarchical structure. It allows the assessment of quantitative and qualitative criteria using a common scale [34]. The hierarchical modeling carried out in AHP allows the conversion of subjective evaluations according to the relative importance between different attributes or criteria into a set of weights or global weights to facilitate decision-making.
According to the AHP, the criteria (in our case mitigation and adaptation actions) are compared using a pairwise approach, in which the researcher estimates the relative importance of each criterion in order to identify the best alternative as a solution to the problem proposed. By applying the AHP, it was possible to perform an analysis of each option in relation to the others through paired comparisons, facilitating an estimation of farmers' preferences.
The methodological structure of this tool is given by three stages: Modeling, evaluation, and prioritization. During the modeling stage, the problem is defined (i.e., identification of farmers' preferences for mitigation and adaptation actions). In this case, the appropriate criteria were identified from a literature review [12]. The identified criteria are shown in Table 1.  [39] M2 Use zero tillage management [40] A3 Introduce improved and resistant seeds [41] M3 Use renewable energy [42] A4 Adapt the sowing calendar [43] M4 Use low-polluting emission and energy-efficient machinery [44] Accordingly, the decision model was structured in the form of a hierarchy, grouping the clusters into different levels ( Figure 2), which were used to carry out the paired comparisons of the elements of each cluster based on the verbal scale. The comparison structure has a pair of criteria (A and M) and a scale in both directions from one to nine; this allows establishing which of the two criteria was preferred and a measure of the relative importance of the preferred criterion (see Table 2). Scale: One means that both criteria have the same importance, two means that the selected criterion has slightly higher importance than the other, up to nine, which means the selected criterion has absolute importance with respect to the other [45].
Once the hierarchy is structured, the actions corresponding to the assessment stage are carried out. This stage corresponds to administering the questionnaire, when the interviewees are asked for the degree of importance they assign to their preference in each pair of criteria in each cluster, identified as mitigation or adaptation actions. (The complete experimental design of the paired comparisons question can be seen in the questionnaire, available in the Supplementary file Farmer_interview.pdf, question 36.) The third stage is prioritization and synthesis. At this stage, the farmers' expressed preferences in the paired comparisons ˆi k a are used to construct the Saaty matrix (Âk) of each cluster, with dimensions n × n = 4 × 4 (where n corresponds to the number of actions within the cluster) and the vector of eigenvalues with the normalized weights corresponding to the cluster in question, which serve to obtain the relative importance, also known as the priority or local weight ˆi k w of the attribute, according to the weighting of judgments issued by the individual (k), which can be estimated by means of the row geometric mean method (RGMM), which will allow multifunctionality assessment to be carried out. The estimation of relative importance (ˆi k w ) was carried out using the Super Decisions software [46]. The verification of farmers' consistency using the consistency ratio [47] showed an average value less than 10%, which is acceptable according to the AHP literature [48]. Finally, in order to obtain the general results of the weight of each attribute, the process was repeated for each individual who was part of the sample (k = 1 to 370).

Farmers' Environmental Attitudes and Opinions by NEP Scale Method
Given current environmental concerns, the study of human attitudes and behaviors toward the environment has become increasingly relevant. These environmental attitudes or opinions can be approximated and expressed by positive or negative evaluations of the relationships between humans and the natural environment [49,50]. There are several methods and scales to approximate individuals' attitudes toward the environment. The Environmental Concerns alternative is a scale that pays specific attention to issues related to transportation, environmental pollution, biodiversity protection, and natural resource use, as well as consumption behavior [51]. The Proactive-Reactive The comparison structure has a pair of criteria (A and M) and a scale in both directions from one to nine; this allows establishing which of the two criteria was preferred and a measure of the relative importance of the preferred criterion (see Table 2). Scale: One means that both criteria have the same importance, two means that the selected criterion has slightly higher importance than the other, up to nine, which means the selected criterion has absolute importance with respect to the other [45].
Once the hierarchy is structured, the actions corresponding to the assessment stage are carried out. This stage corresponds to administering the questionnaire, when the interviewees are asked for the degree of importance they assign to their preference in each pair of criteria in each cluster, identified as mitigation or adaptation actions. (The complete experimental design of the paired comparisons question can be seen in the questionnaire, available in the Supplementary Materials, question 36.) The third stage is prioritization and synthesis. At this stage, the farmers' expressed preferences in the paired comparisonsâ ik are used to construct the Saaty matrix (Â k ) of each cluster, with dimensions n × n = 4 × 4 (where n corresponds to the number of actions within the cluster) and the vector of eigenvalues with the normalized weights corresponding to the cluster in question, which serve to obtain the relative importance, also known as the priority or local weightŵ ik of the attribute, according to the weighting of judgments issued by the individual (k), which can be estimated by means of the row geometric mean method (RGMM), which will allow multifunctionality assessment to be carried out. The estimation of relative importance (ŵ ik ) was carried out using the Super Decisions software [46]. The verification of farmers' consistency using the consistency ratio [47] showed an average value less than 10%, which is acceptable according to the AHP literature [48]. Finally, in order to obtain the general results of the weight of each attribute, the process was repeated for each individual who was part of the sample (k = 1 to 370).

Farmers' Environmental Attitudes and Opinions by NEP Scale Method
Given current environmental concerns, the study of human attitudes and behaviors toward the environment has become increasingly relevant. These environmental attitudes or opinions can be approximated and expressed by positive or negative evaluations of the relationships between humans and the natural environment [49,50]. There are several methods and scales to approximate individuals' attitudes toward the environment. The Environmental Concerns alternative is a scale that pays specific attention to issues related to transportation, environmental pollution, biodiversity protection, and natural resource use, as well as consumption behavior [51]. The Proactive-Reactive Environmental Management scale is another alternative that allows the evaluation of different environmental practices, in which the proactive actions are aimed at modifying the processes that negatively affect the environment and the reactive ones are aimed at repairing current negative effects [52].
Among the array of alternative methods to measure environmental attitude, the New Ecological Paradigm (NEP) scale is one alternative that can be adapted to identify the psychological tendency reflecting the relationship that humans have with the environment [53,54] in an economic context, such as agricultural production. Individuals' attitudes can be identified as latent environmental dimensions principally reflecting an ecocentric or anthropocentric perspective. An ecocentric attitude is related to statements in which someone expresses a vision in favor of nature, considering that humans cause disequilibrium by their use of the environment, while an anthropocentric attitude considers that the environment can support the intensive use of natural resources, expressed through statements in which humans are said to have supremacy [55]. In this study, we used an NEP scale composed of 16 statements in order to analyze farmers' environmental attitudes. The agreement level for each statement was measured according to a 9-point Likert-type scale, where one represents total disagreement with the statement, five corresponds to a neutral opinion, and nine represents total agreement with the statement. The statements used in the experimental design to identify farmers' latent environmental dimensions can be seen in the questionnaire, available in the Supplementary Materials, question 27.

Farmers' Risk Attitude Using the MPL Lottery Method
Decision-making under uncertainty depends to a large extent on the risk attitude of economic agents. It is related to each person's behavior and influenced by socioeconomic factors and experiences [56]. In the agricultural field, the decisions made by farmers are affected by their level of aversion to or tolerance of risk that is related to their farm management and crop cultivation strategy and periodicity. They are also related to farmers' attitudes toward the environment and their perception of climate change [12].
The multiple price list (MPL), also known as a "lottery," is one of the tools most recently used to identify farmers' stated attitudes about risk under uncertainty (i.e., the level of risk tolerance or aversion). It relates levels of risk with reward or loss in a lottery. According to this method, an array of eight questions is proposed as lottery scenarios, with a pair of hypothetical alternatives from which to select, option A and option B, both with constant probabilities in each scenario. Option A (the safe option) determines the level of risk aversion, and depending on the number of scenarios in which the interviewee selects this option, once he/she decides to change to option B (the risky option), the interview must be stopped to avoid inconsistencies. If a farmer selects the risky option (option B) in the first scenario, it indicates that he/she is tolerant of risk; if the farmer selects option A in the first three scenarios and it then changes to option B in scenario four, it indicates that he/she has a neutral attitude toward risk; and a risk-averse farmer will choose the safe option (option A) in all scenarios [57]. According to the Holt and Laury scale, a risk-tolerant person corresponds to a risk coefficient from −1.75 to less than −0.15, a risk-neutral person corresponds to a risk coefficient from −0.15 to less than 0.14, and a risk-averse person corresponds to a risk coefficient of 0.14 or greater [58]. The experimental design used to identify the declared level of risk can be seen in the Supplementary Materials, question 35.

Farmers' Perceptions of Climate Change
The perception of climate change in farming activities is based on an analysis of the variability of phenomena such as increased temperature; varied levels and timing of rainfall; decreased soil fertility; increased periods of drought; decreased yields; increased drought episodes, frosts, floods, hailstorms, and plagues; and changes in vegetation [59]. Farmers' perceptions of climate change are also relevant as they are related to their farming decisions and practice [60]. Statements related to these phenomena identified from the literature [61][62][63][64][65][66][67][68][69] were used to evaluate farmers' agreement or disagreement using a Likert-type scale ranging from one to nine, where one corresponds to absolute disagreement and nine corresponds to absolute agreement with the statement. The proposed statements allow an assessment of farmers' opinions on issues such as the instability of meteorological factors and events related to climatic conditions.

Technical Efficiency
Results show that the average TE estimate is 0.57, indicating that farmers reach 57% of their maximum potential output, and the majority of them have average efficiency scores (72% moderately efficient, 13% low TE score, and 15% high TE score). Moreover, results suggest that farmers could increase their output by 43% on average if they used available resources more effectively with the same production technology. Thus, there is a large opportunity to improve TE by a more rational and less arbitrary use of inputs that would reduce production costs and contribute to the farm's livelihood.
It is considered that low efficiency may be associated with a misuse of existing technology, so optimization has to do with, among other things, optimizing the irrigation infrastructure, focused on substantially reducing water and energy consumption [70], given that, generally, energy consumption can be considered one of the most significant expenses associated with agricultural production. Additionally, reducing energy consumption would bring economic savings and reduce polluting emissions in the environment, resulting in a more sustainable form of agriculture.
Results also show that farmers who use family labor to a greater extent instead of hiring labor dedicated exclusively to agricultural activities have less technical efficiency, which indicates a need for greater professionalization and specialization of the people in charge of tasks in the field. This result differs from that obtained in a study [71], in which the presence of family labor greatly improved technical efficiency [72]. This difference could be attributed to the size of the farm, which in our case study was about 10.60 ha on average. When the size of the farm increases, more specialized labor is required and family labor may not be able to satisfy the need. In any case, it is important to note that Marquez et al. (2013) also indicate that the significance of this relationship can also be related to the methodological framework used to estimate TE.
Another action that we believe contributes to an improvement of technical efficiency is changing crops, given that the type of crop defines the amount of resources required, such as water, fertilizers, labor, machinery, etc. [73]. In addition, implementing more ecological techniques such as zero tillage contributes to increased technical efficiency due to a decreased use of energy resources and labor on the farm [74] (unlike conventional agriculture, which uses intensive tillage, significantly increasing costs for energy consumption, causing additional soil erosion, runoff, and pollution by sediment, with fertilizers and pesticides that will impact the subsoil and aquifers).

Adaptation and Mitigation Preferences
The results of the analysis of preferences estimated by the AHP method (Table 3) reveal that mitigation actions (M = 58.19%) were relatively more preferred compared to adaptation ones (A = 41.81%). The highest in relative importance compared to other actions is the mitigation alternative "use low-polluting emission and energy-efficient machinery" (M4 = 17.94%). These results, in relation to climate change impact reduction, show that mitigation actions must be a priority, as also affirmed by Bragado (2016) [75]. The second most popular option was the alternative "use zero tillage management" (M2 = 14%), and the third was "use renewable energy" (M3 = 13.71%).  According to the relative relevance assigned to adaptation and mitigation options (see Figure  3), we identified how many farmers in the sample assigned the highest global weight to each option. The action most preferred by farmers to reduce the effects of climate change was M4, "Use low-polluting emission and energy-efficient machinery," a mitigation action; the second and third preferred actions were A1, "Invest in improved irrigation infrastructure," and A2, "Change crops," both adaption options.

Environmental Attitudes
According to the analysis of environmental attitudes, the NEP scale showed that two-thirds of farmers had a positive position on the environment, emphasizing their ecocentric attitude (see Figure 4), which means that most farmers consider nature to be a good thing that should be protected regardless of whether it generates direct benefits or not, such as through responsible consumption and use of clean energy. Furthermore, farmers expressed a higher preference for maintaining environmental resources and the regeneration of natural processes. The remaining farmers had an undefined position on the environment. They expressed agreement with affirmations where the importance of nature is highlighted and with affirmations that defend the human right to use environmental resources. However, in other cases, both affirmations received a According to the relative relevance assigned to adaptation and mitigation options (see Figure 3), we identified how many farmers in the sample assigned the highest global weight to each option. The action most preferred by farmers to reduce the effects of climate change was M4, "Use low-polluting emission and energy-efficient machinery," a mitigation action; the second and third preferred actions were A1, "Invest in improved irrigation infrastructure," and A2, "Change crops," both adaption options.  According to the relative relevance assigned to adaptation and mitigation options (see Figure  3), we identified how many farmers in the sample assigned the highest global weight to each option. The action most preferred by farmers to reduce the effects of climate change was M4, "Use low-polluting emission and energy-efficient machinery," a mitigation action; the second and third preferred actions were A1, "Invest in improved irrigation infrastructure," and A2, "Change crops," both adaption options.

Environmental Attitudes
According to the analysis of environmental attitudes, the NEP scale showed that two-thirds of farmers had a positive position on the environment, emphasizing their ecocentric attitude (see Figure 4), which means that most farmers consider nature to be a good thing that should be protected regardless of whether it generates direct benefits or not, such as through responsible consumption and use of clean energy. Furthermore, farmers expressed a higher preference for maintaining environmental resources and the regeneration of natural processes. The remaining farmers had an undefined position on the environment. They expressed agreement with affirmations where the importance of nature is highlighted and with affirmations that defend the human right to use environmental resources. However, in other cases, both affirmations received a

Environmental Attitudes
According to the analysis of environmental attitudes, the NEP scale showed that two-thirds of farmers had a positive position on the environment, emphasizing their ecocentric attitude (see Figure 4), which means that most farmers consider nature to be a good thing that should be protected regardless of whether it generates direct benefits or not, such as through responsible consumption and use of clean energy. Furthermore, farmers expressed a higher preference for maintaining environmental resources and the regeneration of natural processes. The remaining farmers had an undefined position on the environment. They expressed agreement with affirmations where the importance of nature is highlighted and with affirmations that defend the human right to use environmental resources. However, in other cases, both affirmations received a high level of disagreement, showing an unclear relationship. There is no conclusive opinion on the environment, that is, they generally do not have a clear environmental opinion; they agree with some ecocentric attitudes and anthropocentric attitudes, or they absolutely disagree with both [76].

Risk Attitudes
Through the analysis of risk attitudes using the MPL method, it was observed that according to the scale proposed by Holt and Laury [58], approximately 51% of farmers had an attitude of risk aversion, while 41% were risk-tolerant and 8% had a neutral attitude about risk. The estimated average of the farmers' risk level had a value of 0.32, placing the farmers studied as slightly averse to risk according to the scale. This result is consistent with results on the level of risk aversion obtained in other studies, such as Pennings and Garcia (2001) and Brick et al. (2012) [57,77].

Climate Change Perceptions
The results of the analysis of climate change perceptions show that farmers perceived a high degree of variation in all climate phenomena presented in the experimental design, according to the answers given during the interview using a 9-point Likert-type scale, where one is absolute disagreement and nine absolute agreement with the statement. Most important was the increasing incidence of diseases and pests (8.23), followed by increased weed problems (7.92), increased temperature (7.46), and the presence of frost episodes (5.98).

Socio-Economic Characteristicvs
Finally, the TE efficiency was related to the socio-economic variables (age, education level, income and percentage of income coming from agricultural activities, origin of their agricultural training education, number of generations devoted to agriculture and property management regime). Results showed that age, property regime and the percentage of income coming from agriculture were significantly related to TE. Young farmers that are owner of their agricultural land with more than 50% of their income coming from agriculture activities are more technically efficient. These results are in line to the finding in Guesmi et al., (2010) and Perdomo and Mendieta (2007) highlighting the age and income variable as determinant factors of TE [31,78].

Technical Efficiency with Regard to Farmers' Preferences, Risk, and Environmental Attitudes and Climate Change Perceptions
As commented above, technical efficiency scores were related to farmers' preferences for adaptation and mitigation actions, environmental attitudes, risk attitude, and climate change perceptions. An analysis of heterogeneity was made by ANOVA and PCA to statistically contrast whether any of these results characterizing farmers' attitudes were related to their level of TE.

Risk Attitudes
Through the analysis of risk attitudes using the MPL method, it was observed that according to the scale proposed by Holt and Laury [58], approximately 51% of farmers had an attitude of risk aversion, while 41% were risk-tolerant and 8% had a neutral attitude about risk. The estimated average of the farmers' risk level had a value of 0.32, placing the farmers studied as slightly averse to risk according to the scale. This result is consistent with results on the level of risk aversion obtained in other studies, such as Pennings and Garcia (2001) and Brick et al. (2012) [57,77].

Climate Change Perceptions
The results of the analysis of climate change perceptions show that farmers perceived a high degree of variation in all climate phenomena presented in the experimental design, according to the answers given during the interview using a 9-point Likert-type scale, where one is absolute disagreement and nine absolute agreement with the statement. Most important was the increasing incidence of diseases and pests (8.23), followed by increased weed problems (7.92), increased temperature (7.46), and the presence of frost episodes (5.98).

Socio-Economic Characteristicvs
Finally, the TE efficiency was related to the socio-economic variables (age, education level, income and percentage of income coming from agricultural activities, origin of their agricultural training education, number of generations devoted to agriculture and property management regime). Results showed that age, property regime and the percentage of income coming from agriculture were significantly related to TE. Young farmers that are owner of their agricultural land with more than 50% of their income coming from agriculture activities are more technically efficient. These results are in line to the finding in Guesmi et al., (2010) and Perdomo and Mendieta (2007) highlighting the age and income variable as determinant factors of TE [31,78].

Technical Efficiency with Regard to Farmers' Preferences, Risk, and Environmental Attitudes and Climate Change Perceptions
As commented above, technical efficiency scores were related to farmers' preferences for adaptation and mitigation actions, environmental attitudes, risk attitude, and climate change perceptions. An analysis of heterogeneity was made by ANOVA and PCA to statistically contrast whether any of these results characterizing farmers' attitudes were related to their level of TE.
Results showed two clearly independent dimensions (see Figure 5) that explain 52.28% of the total variance. In Figure 5, the horizontal axis represents climate change perception. Farmers on the right side are more sensitive and farmers on the left side are less sensitive to climate change problems. The vertical axis represents TE, environmental attitudes, and preferences for significant actions against climate change. Farmers on the upper part are more efficient compared to the lower part. The same description also holds for anthropocentric and ecocentric attitudes. Finally, the preference for crop changes is located on the opposed side of the preference for improving irrigation systems as adaptation actions. Results showed two clearly independent dimensions (see Figure 5) that explain 52.28% of the total variance. In Figure 5, the horizontal axis represents climate change perception. Farmers on the right side are more sensitive and farmers on the left side are less sensitive to climate change problems. The vertical axis represents TE, environmental attitudes, and preferences for significant actions against climate change. Farmers on the upper part are more efficient compared to the lower part. The same description also holds for anthropocentric and ecocentric attitudes. Finally, the preference for crop changes is located on the opposed side of the preference for improving irrigation systems as adaptation actions. Results show that the most efficient farmers (green dots) preferred the "change crops" adaptation action, highlighting the importance of adopting new, productive, low-water-demand and disease-resistant varieties to face climate change. According to Estrada et al. (2006), crops must be diversified to maximize yields, yet generally farmers do not diversify but specialize in a specific crop, citing economic factors for this decision [79]. These farmers exhibited an anthropocentric attitude toward the environment, highlighting relatively less sensitivity to climate change issues. In particular, lower perception was found regarding the variation of environmental phenomena such as droughts and freezing episodes. Derived from previous results, as also commented by Ovares (2016), climate change perception is related to anthropocentric attitudes [80], and we can argue that a lack of environmental interest or ignorance of the effects of production activities on the environment is related to unawareness of climate variation. In this context, it is necessary to identify whether technical efficiency has been achieved to the detriment of the environment.
Farmers with lower technical efficiency (black dots), preferred the investment in irrigation facilities as an adaptation action and exhibited ecocentric attitude. This low level of TE could be related to their extensive production system and to the type of farming managements. These include the adoption of low soil degradation strategy by applying zero or low tillage agriculture, low use of phytosanitary and following a natural crop rotation. The less efficient farmers are taking advantage of the available natural resources with low adopting level of technological innovations. This result is similar to the finding of Alvarez and Del Corral (2010) who stated that farmers adopting intensive Results show that the most efficient farmers (green dots) preferred the "change crops" adaptation action, highlighting the importance of adopting new, productive, low-water-demand and disease-resistant varieties to face climate change. According to Estrada et al. (2006), crops must be diversified to maximize yields, yet generally farmers do not diversify but specialize in a specific crop, citing economic factors for this decision [79]. These farmers exhibited an anthropocentric attitude toward the environment, highlighting relatively less sensitivity to climate change issues. In particular, lower perception was found regarding the variation of environmental phenomena such as droughts and freezing episodes. Derived from previous results, as also commented by Ovares (2016), climate change perception is related to anthropocentric attitudes [80], and we can argue that a lack of environmental interest or ignorance of the effects of production activities on the environment is related to unawareness of climate variation. In this context, it is necessary to identify whether technical efficiency has been achieved to the detriment of the environment.
Farmers with lower technical efficiency (black dots), preferred the investment in irrigation facilities as an adaptation action and exhibited ecocentric attitude. This low level of TE could be related to their extensive production system and to the type of farming managements. These include the adoption of low soil degradation strategy by applying zero or low tillage agriculture, low use of phytosanitary and following a natural crop rotation. The less efficient farmers are taking advantage of the available natural resources with low adopting level of technological innovations. This result is similar to the finding of Alvarez and Del Corral (2010) who stated that farmers adopting intensive agriculture technology are more productive and more technically efficient than the extensive ones [81]. In this context, the decision-making of ecocentric farmers is driven not only by their economic objectives but also by the environmental one. They tend to preserve the environment as an input of their activities that ensure the generation of a satisfactory income [28]. The ecocentric farmers could adopt agricultural technologies that positively impact their productivity and are environmental friendly [82], such as the adoption of efficient irrigation system. From a sustainable agriculture point of view, a balance is required between their economic, social and environmental components. Otherwise, any other position in favour of only one of these factors it supposes the detriment of the rest.
Their perception of climate change was not clearly defined, with a slight tendency toward low perception levels. According to these results, we can deduce that the main problem faced by less efficient farmers is the availability of water, or specifically the need to optimize its use, given the high cost of water in the production of crops. Irrigation systems are a key element in achieving high technical efficiency in agricultural production [83]. The unclear position regarding climate change does not allow them to identify that the cost derived from water consumption is due to the increased use of water because of variation in the climate (greater evapotranspiration due to increased temperature, lower humidity in soil as a result of drought). The effects of climate change, identified by farmers mainly as increasing temperature and increased incidence of diseases and pests and weed problems, were perceived to a greater extent by moderately efficient farmers.
Finally, according to the results of this study, non significant evidence was found for a relationship between the stated attitude about risk and technical efficiency. This could be related to the nature of the data, with relatively homogeneous outcomes, with most producers in the region being risk averse and moderately efficient.

Conclusions
Rural areas that are vulnerable to the impacts of climate change, where agriculture plays a relevant economic role, show the importance of implementing region-specific adaptation and mitigation strategies to improve the level of technical efficiency at the farm level. Adopting these actions does not imply greater technification of the field, but better use of currently available resources and inputs by introducing alternative farm management systems such as using organic agriculture and zero tillage, adapting the sowing calendar, and changing crops.
The effects of climate change on agro systems depend on the type of agricultural production system implemented. Thus, it is necessary to adapt these systems according to the changing requirements of the natural environment caused by climatic variation, in order to increase production capacity through the optimal use of available resources, resulting in a higher level of technical efficiency.
Our results suggest a need to take advantage of available resources in order to face the adverse effects of climate change. Adopting the use of improved seeds and changing crops are among the most important actions according to farmers' preferences. Agricultural policy-makers must generate incentives for farmers in the region to adopt these types of adaptation actions, and disseminate technical information on best practices to encourage them to put these actions into practice.
In relation to farmers with less technical efficiency, whose environmental attitude was more ecocentric, their ecological efficiency should also be accounted for through more sustainable use of water resources, as this is one of the main factors that negatively affects agricultural performance.
In the agricultural sector, the economic policies that are implemented must be aimed at increasing the income and improving the livelihoods of rural households in order to improve their capacities and productive assets through the sustainable use of resources. Our results show that competent authorities need to include several actions that could represent a roadmap in the region studied. First, there is a need to conduct research regarding the impacts of climate change on agriculture in the region from a multidisciplinary perspective, in order to identify the impact of implementing adaptation and mitigation actions on agricultural productivity patterns. Second, this research highlights the importance of identifying crop varieties that are better adapted to the new climatic conditions in the region. The adoption of this measure should be accompanied by dissemination campaigns to share experiences from other farmers and offer information on the economic, social, and environmental benefits of adopting these practices. Third, training schemes on agricultural practices of adaptation and mitigation should be generated by agricultural associations to improve the rational use and conservation of natural resources, in order to reduce the risk aversion and increase the likeliness of implementing the new practices. Finally, economic incentive programs should be established that could help farmers to introduce new sustainable management practices at the farm level that increase their productivity and respect the environment, specifically mitigation actions.
In this study, one of the limitations was related to the data collection process in terms of the veracity of the economic information gathered from farmers. Some producers were not able to provide all the needed information and others refrained from responding reliably to the questions, due to either a lack of understanding or lack of interest. For further research, it could be interesting to include variables accounting for social and environmental externalities in the calculation of efficiency to better highlight a more sustainable indicator.