Hottest Year Ever on Record

To date, this is the hottest year ever recorded since reliable temperature recording began in 1880, says the National Oceanic and Atmospheric Administration (NOAA).

Although NOAA experts say global climate change isn't the only reason 2010 has been so hot -- an El Nino event earlier in the year pushed temperatures up -- they said it's still the most important reason. 

"We would not be where we are without the influence of climate change", said Deke Arndt of NOAA's National Climatic Data Center.

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