No, but 2010 *will* be the hottest year globally in all of recorded history.
"2009 was the hottest year globally in all of recorded history."
It was in the top 10 -- #7 if you count only land temperatures, #5 including ocean temperatures -- but not #1, because the Sun's output was particularly low.
This is hard for deniars to grasp, but good for my allies (I include you, okay?) to know, so I'm going to do my best to explain. While Solar output was especially low, global mean temperature was still especially high last year, because CO₂ was still so much heat that it was like wearing a thick sweater in "comfortable" late spring weather.
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Global land and ocean annual surface temperatures through December tied with 2006 as the fifth warmest on record, at 0.56°C (1.01°F) above the 20th century average.
The 2000-2009 decade is the warmest on record, with an average global surface temperature of 0.54°C (0.96°F) above the 20th century average. This shattered the 1990s value of 0.36°C (0.65°F).
Ocean surface temperatures (through December) tied with 2002 and 2004 as the fourth warmest on record, at 0.48°C (0.86°F) above the 20th century average.
Land surface temperatures through December tied with 2003 as the seventh warmest on record, at 0.77°C (1.39°F) above the 20th century average.
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