Two degrees is too much
The interview below was recorded 5th May 2015 on an Aussie radio station with James Hansen, a former director of a NASA research institute and NASA researcher of 46 years standing. Hansen's original research subject in the 1960's was a planet with a runaway carbon dioxide global warming problem - our next door neighbour, Venus. He admits wind turbines and other renewables can help a bit, but nowhere near enough. If you're interested in this subject, please spare a few minutes to listen to it. http://www.abc.net.au/radionational/programs/breakfast/two-degrees-of-global-warming-is-not-safe/6444698