[freebeard]

Welp, there it is.

Washington Post : We’ve been accidentally cooling the planet — and it’s about to stop

It is widely accepted that humans have been heating up the planet for over a century by burning coal, oil and gas. Earth has already warmed by almost 1.2 degrees Celsius (2.2 degrees Fahrenheit) since preindustrial times, and the planet is poised to race past the hoped-for limit of 1.5 degrees Celsius of warming.

But fewer people know that burning fossil fuels doesn’t just cause global warming - it also causes global cooling. It is one of the great ironies of climate change that air pollution, which has killed tens of millions, has also curbed some of the worst effects of a warming planet.

Tiny particles from the combustion of coal, oil and gas can reflect sunlight and spur the formation of clouds, shading the planet from the sun’s rays. Since the 1980s, those particles have offset between 40 and 80 percent of the warming caused by greenhouse gases.

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.