Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. VOCs are released from gasoline, paints, and many cleaning solvents. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog. Kuylenstierna does not see efforts to reduce soot and smog as part of the UNFCCC process. Black carbon and ground-level ozone cause global warming but their effects are measured in days or months, whereas carbon dioxide emitted today will continue to warm the atmosphere for centuries. “Big cuts in emissions of black
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