http://www.foxnews.com/science/2013/05/31/giant-asteroid-to-sail-past-earth-today-watch-it-live/
'Study sees climate upside in greening arid regions
Rising carbon dioxide in the atmosphere has a "fertilization effect" on plants in arid regions that has contributed to the flourishing of foliage there, Australian researchers report.'
http://www.usatoday.com/story/news/nation/2013/05/31/study-climate-change/2377179/