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Happy Earth Day! Here are some big and small ways to reduce your carbon footprint.
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6th mass extinction is underway in Minn. — but squads of defenders are fighting back
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The Supreme Court gave states more power over wetlands. Water experts fear a 'race to the bottom' has begun.
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Science briefs: Mysterious skeletons of lake in Himalayas
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Restoring former farmland: 'The system doesn't just bounce back'