National Geographic: What would the 1980s have been without big hair and ice-cold wine coolers? Luckily no one had to find out: Key substitutions in hairsprays and refrigerants allowed such products to exist without chlorofluorocarbons (CFCs), which were found to be ripping a huge “hole” in Earth’s protective ozone layer. Today the ozone hole, which was first spotted 25 years ago, appears headed for a happy ending, thanks to unprecedented international action. Could a similar effort rein in …