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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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The fragile layer of gas that protects all living things on Earth from the sun's harsh ultraviolet light is on the mend, in other words, the ozone hole is healing.

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That's according to the latest assessment by the World Meteorological Organization and the United Nations Environment Programme.

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The ozone hole had been growing for decades over Antarctica.

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But the world recognized the problem and took action more than a quarter-century ago.

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The 1987 Montreal Protocol phased out the use of chlorofluorocarbons, or CFCs, responsible.

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With the ozone-damaging compounds gone, the layer had a chance to recover and the hole is no longer growing.

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A bonus: the phase-out also helped slow global warming.

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Because CFCs are also powerful greenhouse gases.

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In fact, the agreement to address the ozone hole has actually cut five times as much the greenhouse gas emissions as has the Kyoto Protocol to address global warming.

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The Montreal Protocol shows that the world can come together to deal with global environmental problems.

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The protocol also illustrates that actions may require decades to yield results.

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Which drives home the need to address our climate crisis now.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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