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1980. The 80s were all about big hair, neon, MTV. And then there was this: Every October a hole appears in the ozone layer over the south pole. hole in the ozone shield is the size of the continental United States. The protective ozone layer is being threatened as never before. We are all at risk. Scientists warned that humanity was on track to completely destroy the ozone layer by 2050. Without it ecosystems would collapse, skin cancer rates would skyrocket, and life as we knew it would cease to exist. But today, the ozone layer is healing. In an unprecedented act, the world came together to prevent an environmental catastrophe. So how did we do it? And what can we learn from it? The ozone layer is a sort of belt around the Earth made up of gaseous molecules. It protects every living thing by absorbing two types of ultraviolet radiation from the Sun. Its a powerful shield, but its also fragile. In 1985, scientists discovered a massive loss of ozone here: right