Chlorofluorocarbons are the best possible solvents to have in car engines for cleaning the electronic sensors in modern automobile ignition systems  These solvents have contributed significantly to automakers' ability to meet legally mandated emission standards
Now automakers will have to phase out the use of chlorofluorocarbons at the same time that emission standards are becoming more stringent
Something other than the cleansers for electronic ignition sensors will make a relatively greater contribution to meeting emission standards than at present.