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If 193 nations hadn't agreed in 1989 to ban the chemicals that eat up the Earth's protective ozone layer, the world would have been a much different place later this century, with nearly two-thirds of the ozone layer gone and the ozone hole a permanent fixture over Antarctica, a new simulation shows. Sunburns would have occurred in a matter of minutes and skin cancer-causing radiation would have soared. [Source: LiveScience]
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