SOURCE: The Guardian

DATE: Tuesday, July 5, 2016

AUTHOR: Dana Nuccitelli

SNIP:

“A recent study, Marvel et al 2015 and prior works suggest that cooling effect of non-CO2 pollution may have been underestimated. This also suggests that climate sensitivity is underestimated (since the net direct impact of human activity would be reduced, requiring a greater sensitivity to achieve the observed temperature change).”

“The work that’s out there now, if anything, favours hotter models in general.”

…when evaluating dangerous global warming, should we consider measured land-ocean temperatures, or faster-warming air temperatures? As Ed Hawkins notes, if we decide climate targets refer to the latter, it puts us about 24% closer to dangerous thresholds. Thus the climate situation may be even more, not less urgent than previously believed.