(chemistry) A salt, Na₂CO₃ formally derived from sodium hydroxide and carbonic acid; it is a white powder, soluble in water, with domestic, commercial and industrial uses; it occurs naturally as natrite

A measure of the amount of carbon dioxide produced by a person, organization or state in a given time.

Having an overall zero carbon footprint after carbon emissions trading has been taken into account.

Water containing carbon dioxide dissolved in it under pressure.

A tax levied on the carbon contents used by the burning fossil fuels, so as to discourage the production of the greenhouse gas carbon dioxide.

calcium carbonate

(inorganic chemistry) A colourless or white inorganic compound, CaCO₃, occurring as chalk, limestone, marble etc; reacts with acids to liberate carbon dioxide.

(chemistry) A fine black powder of amorphous carbon manufactured by the incomplete combustion of natural gas or oil, and used as a pigment in the manufacture of ink and paint. Used as a filler in rubber like polymers and rubber. It helps the polymers resist deterioration by ultraviolet rays.

A weak unstable acid, H₂CO₃, known only in solution, and as carbonate salts; it is present in carbonated drinks, and sparkling wine, but decomposes to form carbon dioxide and water.

(inorganic chemistry) The normal oxide of carbon, CO₂; a colorless, odorless gas formed during respiration and combustion and consumed by plants during photosynthesis.