The head of Greenpeace offers himself as a guarantor in exchange for release of 'piracy' activists held in Russia.

Greenpeace International Executive Director Kumi Naidoo joins Moyers & Company to discuss the politics of global warming and the urgency of environmental activism.

The head of Greenpeace International talks with Bill Moyers about the best and worst case scenarios for the Greenpeace activists taken into custody by Russian authorities.