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You can’t see particles smaller than 2.5 microns. But they kill 3.4 million people a year. Climate change is going to have profound consequences on human health and survival. Most obviously, a hotter world means more heat stroke and other heat-caused deaths.

If you look at the smudged skylines of Los Angeles, California or Beijing, China, the haziness creates the illusion of cities shrouded in perpetual gray. That smog is driven by a pollutant that doe…