Greenpeace is an international, nongovernmental, environmental, peace-seeking activist group. Whooo, that's quite the introduction, but one that's well-deserved.

Greenpeace works on major issues like combating global warming, providing humanitarian aid, and, of course, fighting the use and development of nuclear weapons.

Established in 1971 in protest of an underground nuclear test on the western edge of Alaska, Greenpeace has always been strongly anti-nuclear. As an independent organization, it frequently throws caution to the wind and disregards pesky rules like international boundaries. For example, in 1982, they entered the USSR without permission to protest Soviet nuclear testing, which is about as gutsy as you can get.

Today, Greenpeace has a worldwide presence and is a loud and influential voice in global politics.