As the U.N. climate summit gets underway in Bonn, Germany, African negotiators, activists and youth are particularly vocal about the need for urgent action to mitigate the most devastating effects of global warming. Africa is expected to suffer more from climate change than any other continent. This summer, flooding and mudslides in Sierra Leone killed more than 1,000 people, while extreme drought has left millions of people at risk of famine in Kenya, Somalia and Ethiopia. We speak with Kumi Naidoo, longtime South African anti-apartheid activist and former head of Greenpeace International. He is the chair of a new organization called Africans Rising for Justice, Peace and Dignity.