Ask any weather expert, and they'll tell you that one of the main ingredients for hurricane formation is rise in temperature of the ocean. (dotearth.blogs.nytimes.com)
The graph shows the dramatic rise in temperature in the northern hemisphere over the past 100 years caused, presumably, by humans. (kottke.org)
It showed a sharp rise in temperature over the last 100 years as man made carbon emissions also increased, creating the shape of a hockey stick. (wattsupwiththat.com)