Bill McKibben, the environmental author-turned-activist, knows his movement is troubled. But he's committed to protecting the environment, so he trudges forward, battling setbacks, death threats and what he sees as his primary enemy: the fossil fuel industry. In 2008, he launched the grassroots campaign 350.org, and last year played a pivotal role in raising public opposition to the Keystone XL pipeline project. But he's concerned he's fighting a losing battle against climate change.
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