Global Warming Hits Southwest

By Mike Davis, TheNation.com. Posted April 16, 2007

The Arctic is not the only theater of unequivocal climate change and polar bears aren't the only heralds of a new age of chaos. Global warming is already affecting the U.S.

The polar bear on its shrinking ice floe has become the urgent icon of global warming and runaway climate change. Even the flat-earther in the White House now concedes that the magnificent bears may be doomed to extinction as the sea ice melts and the Arctic Ocean is transformed into open blue water for the first time in millions of years. Humanity's "great geophysical experiment," as the oceanographer Roger Revelle long ago characterized the steeply rising curve of carbon dioxide emission, has knocked nature off its Holocene foundations in the circumpolar lands.

But the Arctic is not the only theater of spectacular and unequivocal climate change, nor are the polar bears the only heralds of a new age of chaos. Consider, for example, some of Ursus maritimus's distant relatives: the black bears that forage happily but ominously in the fabled Chisos Mountains of Texas's Big Bend National Park. They may be the messengers of an environmental transformation in the Borderlands almost as radical as that taking place in Alaska or Greenland.