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Its conclusion is that temperature increased and decreased a little over the centuries, but the fluctuations were small enough that the line was roughly flat, like the shaft of a horizontal hockey stick. Then, from about 1980 to now, temperature increased sharply, more than any increase before - like the blade of the hockey stick. For the past 10 years, climate-change skeptics have been calling the hockey stick bogus. Now the scientists who studied the climate record and produced the original hockey-stick graph have done a new study using more data from more sources - and they got the same pattern.

Global Warming Using Data, Charts, Models, Animations, Web Links and Videos to Learn About Climate Change