Many groups are trying to make their voices heard over the issue of climate change, trying to get world leaders to attend the United Nations Climate Summit in Copenhagen in December. Some groups are taking more extreme approaches than others. For instance, a group of 700 volunteers in Burgundy, France, stripped down and posed for the photographer Spencer Tunick to illustrate the threat of global warming, especially its effects on wine and agriculture in France, through art.

I'm guessing that living in a tree for months on end or chaining themselves to heavy machinery wasn't getting the message across. According to Greenpeace's website: