Video: Obama on climate change

President Obama devoted the final ten minutes of his speech at Kotezbue's middle and high school to laying out evidence of climate change and the solutions he is spearheading. The president mentioned the village of Kivalina at the edge of the Chuckchi Sea on a sliver of gravel not even a quarter-mile across at its widest point. Obama flew over the barrier island this afternoon to see it firsthand. "What's happening here is America's wake-up call," he said. "It should be the world's wake-up call."

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