carbon dioxide - the gas formed and released when carbon is burned, or when people or animals breathe out, carbon footprint - a measurement of the amount of carbon dioxide produced by the activities of a person, company, organisation, etc., energy efficient - used to describe things that use only as much energy as is needed without wasting any, exhaust fumes - the waste gases from a vehicle's engine, fossil fuel - a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms, global warming - An increase in the average temperature of the earth's atmosphere becuase of pollution, greenhouse gas - a gas that causes the greenhouse effect, especially carbon dioxide, renewable resource - can be produced as quickly as it is used, solar power - energy from the sun, wind power - power derived from the wind (as by windmills),

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