Carbon-fluorine compounds that often contain other elements such as hydrogen, chlorine or bromine. Common fluorocarbons include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs) and perfluorocarbons (PFCs).
A general term for organic materials formed from decayed plants and animals that have been converted to crude oil, coal, natural gas or heavy oils by exposure to heat and pressure in the Earth’s crust over hundreds of millions of years.
In general, this refers to substituting one type of fuel for another, such as switching from coal to natural gas. With regard to climate change, it is implicit that the substituted fuel generates lower carbon emissions per unit energy than the original fuel.