Ahead of the meeting, the US announced its goal to halve emissions from 2005 levels by the end of this decade. It was one of a number of pledges announced by world leaders at Thursday's Earth Day summit.This episode: White House correspondent Ayesha Rascoe, White House correspondent Scott Detrow, and science correspondentConnect:Subscribe to the NPR Politics Podcast here.Email the show at nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Listen to our playlist The NPR Politics Daily Workout.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station. Lauren Sommer.