The GOOD 100: 350.org

Since writing what's generally regarded as the first book about climate change for the general public, 1989's The End of Nature, Bill McKibben's star has been continually rising. Unfortunately, so have atmospheric carbon dioxide levels. That's why McKibben's website 350.org-an international initiative spreading the word about the critical need to reduce global carbon levels to 350 parts per million-continues to make noise, urging politicians to commit to swift and sweeping carbon legislation. With your help, that might happen.