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Nobel Peace Laureate Wangari Maathai: If US Moves Forward on Climate Change, Rest of World Will Follow

A new overview of research on global warming has found climate change is happening faster and on a broader scale than scientists projected in 2007. The new findings come in a week where the issue of global warming is at the fore with a one-day UN summit on climate change and the G-20 in Pittsburgh. We speak with the Nobel Peace Prize-winning Kenyan environmentalist Wangari Maathai, who was chosen to speak on behalf of international civil society at the UN summit.