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A science brief by James E. Hansen and Makiko Sato can be found at the NASA Goddard Institute for Space Studies website. Models, they say, can be a tool for understanding climate change, but paleoclimate studies are necessary to evaluate the impact of human-imposed warming. And, as we learn in APES, as the ice sheets melt, the surface albedo decreases, the surface warms, which makes the ice sheets melt, and the surface albedo decreases, the surface warms, and...well, you get the point. A nice positive feedback loop. But what does it mean for us right now?
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