[freebeard]

www.yahoo.com/: We’ve been accidentally cooling the planet — and it’s about to stop

And now, as society cleans up pollution, that cooling effect is waning. New regulations have cut the amount of sulfur aerosols from global shipping traffic across the oceans; China, fighting its own air pollution problem, has slashed sulfur pollution dramatically in the last decade.

The result is even warmer temperatures - but exactly how much warmer is still under debate. The answer will have lasting impacts on humanity’s ability to meet its climate goals.
....
But the real issue is still ahead. Currently, the U.N. Intergovernmental Panel on Climate Change estimates that aerosols are masking about 0.5 degrees Celsius of global warming. But that value could be as high as 1 degree or as low as 0.2 degrees - and the difference could be the difference between meeting the goals of the 2015 Paris agreement or not.

If aerosols have been masking cooling much more than expected, for example, the world could be poised to blow past its climate targets without realizing it.