I hear this all the time.

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This is what has conservation biologists worried. It's the combined effects of climate change pushing things to want to shift around the globe, and human habitat destruction ... preventing that movement.

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We're definitely seeing species going extinct because of climate change. We're going to lose the penguins. We're going to lose the polar bears, no question. . . . I'm seeing high mountain butterflies literally being pushed off the mountains. This is happening. It is not theory. It is not people saying, 'Oh, we think it might happen.' It is happening, and it is incredibly depressing.

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