World leaders are heading to Brazil ahead of the upcoming UN Climate Summit there. One of the highest profile attendees is Britain's Prince William. But before that, he's hosting his own gathering for his annual Earthshot Prize. Today, Christiane moderates the Earthshot Impact Assembly and she sat down with the man at the center of it all, Prince William. 

Also on today's show: Brian Lehrer, Radio Host, WNYC & Ron Brownstein, Bloomberg Opinion Columnist; author Scott Galloway ("Notes on Being a Man")