Conversations about climate change have ranged from skepticism that it exists in the first place to strategies for ending it. Today, we have a different conversation with environmentalist Mark Hertsgaard, author of HOT: Living Through the Next Fifty Years on Earth. He believes the challenge is no longer just to halt and reverse global warming, but also to live through the substantial climate change that is now locked in for the coming decades. And, the Peace Corps celebrates its 50th anniversary this year. On Global Activism we commemorate the volunteer program’s legacy with several former Peace Corps volunteers.