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Posted Thu Jan 28 2010: from Nature, via BBC:
Temperature and CO2 feedback loop 'weaker than thought'
The most alarming forecasts of natural systems amplifying the human-induced greenhouse effect may be too high, according to a new report. The study in Nature confirms that as the planet warms, oceans and forests will absorb proportionally less CO2. It says this will increase the effects of man-made warming -- but much less than recent research has suggested. The authors warn, though, that their research will not reduce projections of future temperature rises. Further, they say their concern about man-made climate change remains high.... The team's calculations are based on a probabilistic analysis of climate variation between the years 1050 and 1800 -- that is, before the Industrial Revolution introduced fossil carbon into the atmosphere.... "We have plenty of reason to believe that the shape of the relationship may change (be nonlinear) when we 'hit the system harder'. So, I don't think they can rule out that the positive feedback from the carbon cycle could become stronger in a significantly warmer climate."
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