NASA’s Goddard Institute for Space Studies has declared 2007 the second-warmest year on record, tying with 1998 for the title. 2005 remains the hottest, according to the agency. Researchers said, to no one’s surprise, that the greatest warming occurred in the Arctic. “As we predicted last year, 2007 was warmer than 2006, continuing the strong warming trend of the past 30 years that has been confidently attributed to the effect of increasing human-made greenhouse gases,” said James Hansen, director of GISS. But in case you’re not comfortable with second-warmest, the U.S. National Oceanic and Atmospheric Administration came out with its own analysis concluding 2007 was the fifth-warmest year on record.