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The refusal of the global temperatures to rise as predicted has caused much angst among academics. “The fact is that we can’t account for the lack of warming at the moment and it is a travesty that we can’t,” wrote one in 2009. Either the instruments were wrong, or the heat energy had gone missing somewhere.
Now a team of academics, after tweaking a statistical model to include sulphur emissions, suggest that coal power stations may be to blame for a lack of global warming since 1998. The IPCC’s 2007 assessment acknowledged the negative radiative forcing (aka, cooling effect) of both natural aerosols from volcanoes and manmade aerosols, but admitted the level of scientific understanding was low. (more…)