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Carbon credits can be categorised into two different types:
1)听 avoidance, for activities that prevent carbon emissions, and
2)听 removal, for activities that remove carbon emissions.听
Carbon markets on which such carbon credits are traded operate on the basis that different companies have different costs in reducing their CO2 emissions. A carbon emitter is therefore able to offset CO2 emitted by purchasing a carbon credit from a company that has a surplus.
There are two types of carbon markets: 鈥渃ompliance鈥� carbon markets and 鈥渧oluntary鈥� carbon markets.
- Compliance carbon markets operate a 鈥渃ap鈥� and 鈥渢rade鈥� system, under which a multinational is required to purchase carbon credits to offset its emissions so that it is under a cap. Under the EU ETS, companies are allocated fee allowances, with further allowances available to purchase via government auctions. These allowances can then be traded. The EU ETS covers high-emitting sectors such as energy, aviation industries 鈥� and since 1 January 2024 the maritime industry.
- Voluntary markets operate to support multinationals鈥� net-zero targets by enabling the purchase of carbon offsets that are underpinned by a specific carbon offset project. The nature of these is wide-ranging, from forestry offset projects to sponsoring cook stoves and other carbon reduction technologies. Carbon offsets sold on voluntary markets are accredited by independent organisations; however, questions have been raised around the effectiveness of such offsets, as there are concerns that the credits may not always accurately report the carbon emissions that have been offset 鈥� the emissions cuts would have happened anyway, or the emissions were moved elsewhere for example.听