The Biden administration has been reversing measures taken by the Trump Administration designed to increase industry profits and employment at the expense of clean air and water. Recently, it reversed a Trump administration policy with a new rule requiring that 50% of cars sold in the United States be zero emissions by 2030.

1. Who suffers from a rule requiring zero emission cars, and who benefits?
2. How should we evaluate policy changes like these? How can we tell if they are good or bad?
3. By themselves, the United States, the People's Republic of China and India account for almost half of world greenhouse gas emissions causing catastrophic climate change. Many of the poorest countries, including those producing the fewest greenhouse gases, will suffer the most from climate change.
   1. Why don't countries most threatened, pay the polluters to stop?
   2. Even the rich will suffer from climate change. Use game theory and the prisoners dilemma to explain why China, India, and the United States don't agree to stop polluting.