Three years ago, most of the world’s nations signed onto the Paris Climate Agreement, which committed countries to do their best to avert a climate catastrophe. Well, things are different now. President Donald Trump has vowed to take the U.S. out of the deal, but the vast majority of countries are still in it, and they met recently in Poland at the United Nation’s annual climate conference to discuss it. NPR’s Rebecca Hersher was there, and on this episode we learn more about the big takeaways.