Researchers have found that the climatic influence of global air pollution has dropped by up to 30% from 2000 levels. Although this is welcome news for public health, it is bad news for GlobalWarming.
It’s one of the paradoxes of global warming. Burning coal or gasoline releases the greenhouse gases that drive climate change. But it also lofts pollution particles that reflect sunlight and cool the planet, offsetting a fraction of the warming. Now, however, as pollution-control technologies spread, both the noxious clouds and their silver lining are starting to dissipate.
Some aerosols, such as black carbon, or soot, absorb heat. But reflective sulfate and nitrate particles have a cooling effect. For many years, they formed from polluting gases escaping from car tailpipes, ship flues, and power plant smokestacks. Technologies to scrub or eliminate this pollution have spread slowly from North America and Europe to the developing world.
Aerosols don’t just reflect light on their own; they can also alter clouds. By serving as nuclei on which water vapor condenses, pollution particles reduce cloud droplet size and increase their number, making clouds more reflective. Reducing pollution should undo the effect—and using the same instruments, Quaas and his team found a clear decrease in cloud droplet concentrations in the same regions where aerosols declined.
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