My latest podcast for the Royal Society of Chemistry features the compounds we loved to boo and hiss before carbon dioxide became our favourite baddy - chlorofluorcarbons or CFCs. Remember the hole in the ozone layer? That's the one.
Amazingly, the same man who came up with CFCs also was responsible for adding lead to petrol - if ever the environmental movement wanted a bad guy, Thomas Midgley was their man. Yet he got a medal for it - because at the time his work seemed brilliant. So slap on the factor 50 and hurry along to the RSC compounds site - or if you've five minutes to spare now, click to to have a listen to my podcast on CFCs.
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