footprint, a mark left on a surface by a person’s foot or shoe or by an animal’s foot, carbon dioxide, a gas breathed out by people and animals from the lungs or produced by burning carbon, coal, a hard black mineral that is found below the ground and burnt to produce heat, nuclear, using, producing or resulting from nuclear energy, biogas, gas, especially methane, that is produced by dead plants and that can be burned to produce heat, hydro, electricity that is produced using the power of water (= hydroelectricity); a place where electricity is produced in this way (= a hydroelectric power plant), solar energy, energy given out by the sun in the form of heat and light, limited, not very great in amount or extent, exhaustible, including everything possible; very careful or complete, abundant, existing in large quantities; more than enough.

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