美国科学60秒 SSS 2012-11-09(在线收听

 Rising seas and severe storms are the most talked-about threats of climate change, but here's another, no more coffee. Because rising temperatures may cripple wild populations of / coffee, the most cultivated species in the world. So says a study in the journal PLoS ONE.

   
  Researchers used climate models to forecast the effects of warming on / coffee trees in Ethiopia, their native range. Under the best case of scenario, meaning fewer emissions and less warming, only a third of today's range would still be suitable for coffee by 2080. And the worst case, wild / could be nearly wiped out in the region. 
   
  That's because coffee trees are sensitive to temperature, the researchers say, and they may not be able to colonize new areas fast enough to beat climate change. That’s assuming no direct human impact, like clearing land for grazing, which is already a problem there. 
   
  Of course, the coffee in your cup doesn't come from wild trees, but wild coffee forests have a much bigger gene pool than cultivated crops, meaning more resistence to disease, pest, and drought. Preserving that diversity might just be grounds to act on climate change.
  原文地址:http://www.tingroom.com/lesson/sasss/2012/11/216406.html