A hole in the ozone layer that appeared above Antarctica in the 1980s has shrunk thanks to a worldwide ban on damaging chemicals, Nasa has confirmed.
Research found that levels of ozone-damaging chlorine are rapidly declining in the planet's atmosphere, a direct indicator that Earth's protective layer is on the mend.
Last year, satellite images seemed to show that the ozone hole had begun to close up, with some scientists suggesting it could fully recover by 2060.

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