Wining about global warming

White and co reckon that well-founded climate change predictions will "imply large changes for the premium wine industry" in the US. But there's something awry. They say,

We estimate that potential premium winegrape production area in the conterminous United States could decline by up to 81% by the late 21st century

So they are sort of extrapolating a present-day industry and its place in an economy over the next eighty years!? While unprecedented demographic, scientific and social revolutions will be going on alongside the climate change?! How much change in the last 80 years, for comparison? How many more many black swans to come? Al Gore (in his An Inconvenient Truth speech[250Mbyte movie]): "What is going now on in our lifetimes is completely and totally different from anything that has happened in all of human history". I hope this wine decline is intended as to be for-the-sake-of-argument reductio-ad-absurdum illustrative because otherwise it's just a sad, silly soundbite for an otherwise quite interesting paper.