How will the US slash emissions by 2030? White House climate adviser Gina McCarthy talks to NPR's Scott Detrow ahead of this week's climate summit with world leaders.This episode: White House correspondents Ayesha Rascoe and Scott Detrow.Connect: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.