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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.