Can America's national parks remain "unimpaired" forever, with their majestic scenery and wildlife unaltered? Global warming makes that impossible, says Wylie Carr, a climate change specialist at the National Park Service.
Can America's national parks remain "unimpaired" forever, with their majestic scenery and wildlife unaltered? Global warming makes that impossible, says Wylie Carr, a climate change specialist at the National Park Service.
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