Nature World News: We are zooming in close to the last ice age, looking at the massive Laurentide ice sheet that covered Canada then, with new research from Oregon State University. What happened may provide ideas as to how Greenland and Antarctica's ice sheets may respond to a changing climate, scientists say.
Here's what happened first: the Laurentide ice sheet began calving icebergs, then abruptly shifted to a focus on melting on the continent, say Oregon State researchers, who were funded by the National Science...