Bloomberg said they were looking for cities with ambitious - yet realistic - goals to address climate change. Pittsburgh wants to use 100% renewable energy by 2030.
From our podcast, Trump on Earth, we hear from New York Times reporter Eric Lipton about the deep ties between the Trump Administration, polluting industries and top agency officials.
Democratic Socialists are on the ballot in states like Florida, Kansas and Pennsylvania. And they have their own ideas about how to save the environment.
There's a growing group of conservatives on Capitol Hill who accept that climate change is caused by us and promote ‘free market’ solutions to the problem.