LiveScience: The permafrost in some of Alaska's most iconic national parks could all but disappear this century, new research suggests. Right now, half of the ground in Denali National Park's is frozen year-round, but if global warming continues at the current pace, just 1 percent of this land could remain permafrost by the year 2100, according to new research presented here at the annual meeting of the American Geophysical Union. Not only could vast swaths of the Alaskan tundra transform into swampy bogs,...