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Saving The Earth's Ozone Layer Went Even Better Than Expected

In 1989, amidst mounting scientific evidence, dozens of nations joined forces to sign a treaty aimed at halting the expansion of a massive hole in Earth's ozone layer. Nearly 30 years later, the Montreal Protocol has done just that. But it has also done something its architects never intended. It has become one of America's most effective tools in the fight against climate change.
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