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| acid rain |
rain that has high acidity because of being mixed with pollutants such as vehicle exhausts and residues from burning of fossil fuels for energy or from chemical manufacturing. |
| alternative energy |
any form of energy other than that which comes from fossil fuel. |
| alternative energy source |
any source of energy other than fossil fuel. |
| alternative fuel |
a fuel other than fossil fuel used to power an internal combustion engine. |
| fossil fuel |
any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuels. |
| green |
of a company or industry, producing energy-efficient or recyclable products and producing them in a way that conserves energy generated from fossil fuels while contributing little to environmental pollution. [3/17 definitions] |
| syngas |
a synthetic gas, produced from the combustion of fossil fuels or biomass, that contains hydrogen and can be used as a fuel. |
| synthetic fuel |
a hydrocarbon fuel produced from fossil fuels such as shale, tar sands, or coal. |
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