Ross Edgley.
(Image credit: Luke Walker/Getty Images for Red Bull)

1. The ozone layer appears to be successfully repairing itself

Here's proof that when countries work together, good things happen. In 1985, scientists discovered a huge hole in the ozone layer above the South Pole. The ozone layer absorbs most of the sun's ultraviolet radiation, which can cause skin cancer and damage crops. Man-made chemicals called chlorofluorocarbons (CFCs) eat at the ozone layer, so in the late 1980s, 180 countries signed the Montreal Protocol, agreeing to phase out CFCs in order to prevent additional holes from forming. A new United Nations report says that the ozone layer is healing itself. By the 2030s, it said, the Northern Hemisphere could be fully repaired, with Antarctica following in the 2060s. The problem is not entirely solved, but this is still "really good news," Paul Newman, the report's co-chairman, told BBC News. "If ozone-depleting substances had continued to increase, we would have seen huge effects. We stopped that."

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Catherine Garcia, The Week US

Catherine Garcia has worked as a senior writer at The Week since 2014. Her writing and reporting have appeared in Entertainment Weekly, The New York Times, Wirecutter, NBC News and "The Book of Jezebel," among others. She's a graduate of the University of Redlands and the Columbia University Graduate School of Journalism.