National Geographic: The past decade has been the hottest on record, according to new global warming data released today at the Copenhagen climate conference by the World Meteorological Organization. What’s more, 2009 is shaping up to be the fifth warmest year since coordinated record keeping began in 1850, according to preliminary figures released by the Geneva-based UN organization. The final report, including December climate data, will be released in March 2010. The new data, collected from …