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Watch John Oliver's 'Salmon Cannon' Hit Stewart, Colbert, Fallon and More

Most people know that hydroelectric dams are not good for the environment. For starters, dams block passage of salmon and steelhead between spawning and rearing habitat and the Pacific Ocean.

"But don't worry, because as we found out recently, America is on it," says Oliver during his late night show as he shows us his "Salmon Cannon."

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