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They are a series of chemicals, also known as CFCs that were discovered in the 1920s and, since they were not harmful to living beings. They became a problem and made a hole in the ozone layer
Internal combustion engines don't emit cloroflorocarbons, but they do emit hydrocarbon's. Hydrocarbons are/is unburned fuel which can be caused by a number of things,but it all leads back to unburned fuel.