Compounds containing either chlorine, bromine or fluorine and carbon. Such compounds can act as powerful greenhouse gases in the atmosphere. The chlorine and bromine containing halocarbons are also involved in the depletion of the ozone layer.
Substances containing only hydrogen and carbon. Fossil fuels are made up of hydrocarbons.
Compounds containing hydrogen, fluorine, chlorine and carbon atoms. Although they are ozone depleting substances and, by association, greenhouse gases, they are less potent at destroying stratospheric ozone than chlorofluorocarbons (CFCs). They have been introduced as temporary replacements for CFCs.
Compounds containing only hydrogen, fluorine and carbon atoms. They were introduced as alternatives to ozone depleting substances in serving many industrial, commercial and personal needs. They do not significantly deplete the stratospheric ozone layer, but they are powerful greenhouse gases.