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Saving Earth's protective stratospheric ozone layer from destruction was a major environmental crusade 30 years ago, leading to the regulation of halocarbons and other ozone-depleting substances. But what would Earth look like today if the 1987 Montreal Protocol on Substances That Deplete the Ozone Layer-the international agreement that restricted halocarbon refrigerants, solvents, and aerosol-can propellants-had not been put into force? [Source: Chemical & Engineering News]
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