Tuesday, 5 June 2012

NASA:GISS: Recent Warming driven mainly by non-CO2 greenhouse gases.

Anthony Watts at WUWT  and his correspondent Nick have uncovered a paper published by Dr. James Hansen (and the GISS team) in PNAS (Proceedings of the National Academy of Sciences).

Hansen with egg on face: C3 Headlines

Global warming in the twenty-first century: An alternative scenario

  1. Valdar Oinas*§
Anthony writes:
No, this isn’t a joke, it isn’t a fake document, and it isn’t a misinterpretation. In the paper (published in 2000, but long since buried) they make these two bold statements (emphasis mine):
..we argue that rapid warming in recent decades has been driven mainly by non-CO2 greenhouse gases (GHGs), such as chlorofluorocarbons, CH4, and N2O, not by the products of fossil fuel burning, CO2 and aerosols..
If sources of CH4 and O3 precursors were reduced in the future, the change in climate forcing by non-CO2 GHGs in the next 50 years could be near zero. Combined with a reduction of black carbon emissions and plausible success in slowing CO2 emissions, this reduction of non-CO2 GHGs could lead to a decline in the rate of global warming, reducing the danger of dramatic climate change.
Read more at WUWT and also at C3 Headlines