The world warmed by about 0.7°C in the 20th century and by the end of the 21st century temperatures will be 3°C warmer than at the beginning of the industrial revolution. Increases in average temperature will be less noticeable than those in extremes. According to a 2009 comparison of over 20 climate models by David Battisti and Rosamond Naylor, by 2050 there is a 10-50% likelihood that the average summer will be hotter than any summer recorded until now. By 2090 the likelihood of this happening rises to 90% in many places.
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