fossil fuel - a source of energy formed over millions of years from parts of dead animals or plants, CO2 emission - carbon dioxide that planes, cars, factories, etc. produce, the greenhouse effect - the slow rise in the temperature of earth's atmosphere, caused by certain gases, greenhouse gas - any type of the gases that are thought to cause the greenhouse effect, especially carbon dioxide, renewable energy source - a type of energy that can be replaced naturally, net zero - a situation in which the harmful gases produced by a particular company, region or country have no impact on the climate because they have been balanced by actions that protect the environment,

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