Blue and Green: Four new manmade gases, possibly derived from chemicals in insecticides and solvents, have been found to be damaging the ozone layer, which helps filter harmful ultraviolet rays.
Three of the gases are chlorofluorocarbons (CFCs) and one is a hydrochlorofluorocarbon (HCFC). Two are accumulating at worrying rates in the atmosphere, but scientists have not identified the exact sources yet.
The identification of these four new gases is very worrying as they will contribute to the destruction of...