13 Feb '18, 3pm

Measurements Show Reduction in Ozone-Eating Chemical

Earth’s ozone layer is slowly healing, and we now have proof that policy decisions have helped. Ever since the Montreal Protocol was drafted in the late 1980s, scientists and policymakers have been looking for signs that their legal curbs on chlorine compounds and related chemicals were stopping the depletion of the ozone layer. They have tracked the amount of chlorofluorocarbons (CFCs) being used in industry and commercial products, while also measuring airborne concentrations near Earth’s surface. They have deployed balloons, instrumented airplanes, and satellites to observe stratospheric ozone over the South Pole (in particular) and around the world. In each case, they have seen signs of improvement. The concentration of CFCs and other ozone-depleting substances near the ground has decreased, as industry has found replacement chemicals that are less damaging to the atmo...

Full article: https://earthobservatory.nasa.gov/IOTD/view.php?id=91694&...

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