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Every day, the clean energy revolution is creating new jobs for American workers. As part of an ongoing series, "Sierra" asked one of them to tell us his story.

Governments are not ready for the coming flood of climate migrants

Capturing the sounds of nature before they disappear.

Buying into America's fastest-growing energy source makes more sense than ever. And not just for wealthy enviros.

Sit. Stay. Track.

Meet the scrappy young athletes who want to save snow...and the planet

Before heading down the toothpaste aisle, know where your brand stands.