Argumentation: When making economic decisions, people tend to consider less or not consider environmental factors, such as cost-benefit analysis like air and water cleanliness, extinction of endangered species, etc  Environmental economists believe that people should consider environmental factors more, It is necessary to give environmental factors a certain economic value  However, the economic value itself comes from the cost-benefit analysis that people make when making economic decisions
Strong, it is impossible to give environmental factors a certain economic value unless people consider environmental factors when making economic decisions
 Conclusion: There exists paradox between basic research objectives of environmental economics and its research methods