Yesterday, NASA announced that burning fossil fuels cools the planet. "But, rather than being good news, NASA has concluded the lack of taking these factors into account means existing climate change models have underestimated at the future impact on global temperatures will be."
Gavin claims that because the study shows a net cooling effect in the northern hemisphere, climate sensitivity to CO2 is actually greater than previously estimated.
"NASA researchers at GISS accomplished a first ever feat by calculating the temperature impact of each of these variables—greenhouse gases, natural and manmade aerosols, ozone concentrations, and land use changes—based on historical observations from 1850 to 2005 using a massive ensemble of computer simulations.
Tony Heller does a nice job collecting old media accounts of the same ice age scare tactic here. The rest of this post is quoted from his web page.