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

Experts say we must take dramatic action on climate change in the next five to ten years. Find out why.

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 discusses the politics of global warming and the urgency of environmental activism.

Find out what Kumi Naidoo, Greenpeace International's executive director, recommends you do to curb climate change and secure the future for the next generation.

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.

The energy industry wants to use unmanned aerial vehicles to monitor pipelines.