Carrying on: In Chicago yesterday, former President Barack Obama called cities “the new face of American leadership on climate change,” commending the charter that 45 mayors signed to cut greenhouse gas emissions by 2025. As President Trump plans to withdraw the U.S. from the landmark Paris Agreement, the mayors’ pact continues local commitments to the international climate accord. USA Today reports:

“In this environment right now, it’s easy sometimes to feel discouraged, and feel as if people a…