EVERYDAY SCIENCE

Detailed explanation-1: -Human activities cause ozone depletion and global warming Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons-gases formerly found in aerosol spray cans and refrigerants-are released into the atmosphere (see details below).

Detailed explanation-2: -Ozone Depletion. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100, 000 ozone molecules before it is removed from the stratosphere.

Detailed explanation-3: -Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules.

Detailed explanation-4: -Chlorine-chlorine is a toxic chemical exerted from Chlorofluorocarbon. It contributes a major portion in depleting the ozone layer and also causing various health problems in human beings and animals. Option D is the correct answer.