| Charcoal (70) |  |
| Firewood (28) | |
| Fuel (1205) | |
| Fueling (12) | |
| Gasoline (131) | |
| Kerosine (9) | |
| Propellant (8) | |
and aerosol propellants (they're now largely phased out by international agreement because they caused significant damage to the ozone layer).
HFCS are used commonly as refrigerants and propellants in aerosols. Currently HFCS comprise only 2 percent of total carbon-dioxide-equivalent emissions
CFCS which are used most widely as refrigerants propellants and solvents (and are better known for their impact on the Earth's ozone layer
and aerosol propellants until they were phased out by international agreement are also greenhouse gases. Three factors affect the degree to
Used in refrigerants, propellants and solvents, CFCS were replaced initially with hydrochlorofluorocarbons (HCFCS); now, chemical manufacturers have moved on to a third-generation replacement, hydrofluorocarbons (HFCS;
Estrada's study links that to the 1987 Montreal Protocol that banned the release of CFCS once used widely in refrigerants, solvents and propellants to stop ozone depletion,
which burn both solid and liquid propellant. XCOR will have di minimus impact on our environment Nelson says Our fuels are almost completely free of particulate matter.
Hydroflourocarbons or HFCS have replaced largely CFCS as refrigerants aerosol propellants and other products. While HFCS are ozone-safe they too are powerful greenhouse gases that have become a concern as world leaders grapple with climate change.
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