latest science report. 1oC is roughly equivalent to the output of all the power stations in the world - that's a lot of energy, hence the bigger weather systems and more extreme weather conditions like the recent hurricane that hit Mexico (fortunately it had calmed down a bit before it hit the land) - the strongest hurricane every recorded in the Northern Hemisphere
http://www.bbc.co.uk/news/science-environment-34763036
http://www.bbc.co.uk/news/science-environment-34763036