On June 1, the U.S. Climate Mayors—a network of more than 300 city leaders, including the mayors of the country’s five largest cities—published a commitment to “adopt, honor, and uphold the commitments to the goals enshrined in the Paris Agreement.” The cities would carry out the promises Donald Trump had abandoned.
I have bad news for this feel-good caucus. Want to fight climate change? You have to fight cars. In the nation’s largest cities, cars account for about a third of greenhouse gas emissions. Nationally, transportation is now the single largest contributor to carbon emissions.