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20. Al Gore
We're sure you've heard of the documentary film An Inconvenient Truth. But did you know that former U.S. Vice President Al Gore, along with the IPCC, received the Nobel Peace Prize in 2007 for his campaign to put climate change on the political agenda?

A decade later, the follow-up documentary, An Inconvenient Sequel, features Gore's continued efforts to persuade worldwide government leaders to invest in renewable energy. Bravo.