Emissions Trading Scheme: Effectively an emissions market where allowances are traded as units of volume e.g. one tonne of carbon dioxide. Participating companies are allocated a number of allowed emissions units of each gas. A company may emit more by purchasing units from the market. Similarly, a company may sell units if they are in excess. The total number of allocation units is fixed and regulated by central and EU government. An ETS imposes a limit on the total emissions according to reduction targets, while allowing companies flexibility.
(Source: www.defra.gov.uk)

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