World may get greener, then wilt, due to warming

Global warming will turn the planet slightly greener by spurring plant growth, but crops and forests may wilt beyond mid-century if temperatures keep rising, Reuters reports a draft U.N. report as saying.
 "Global agricultural production potential is likely to increase with increases in global average temperature up to about 3 Celsius (5.4 Fahrenheit), but above this it is very likely to decrease," the draft said.
Plants in tropical and dry regions from Africa to Asia are set to suffer from even a small rise in temperatures, threatening more hunger linked
But some plants in temperate regions, such as parts of Europe or North and South America , could grow more in a slightly warmer world, according to the draft.