Guardian: We Homo sapiens got lucky. Very lucky. Back in the 1920s, when looking for a safe gas to use in refrigerators, chlorine was the element of choice in a new family of manmade chemical compounds chlorofluorocarbons. In the 1970s, Paul Crutzen, Mario Molina and Sherwood Rowland discovered that while it was safe in our fridges, it was destroying the ozone layer, which is essential to protect all life on land.
Luck struck twice. Nasa scientists measuring ozone above Antarctica in the 1980s never...