There are broadly two types of carbon markets that exist today— compliance markets and voluntary markets.
Voluntary markets
- Voluntary markets are those in which emitters— corporations, private individuals, and others— buy carbon credits to offset the emission of one tonne of CO 2 or equivalent greenhouse gases.
- Such carbon credits are created by activities which reduce CO 2 from the air, such as afforestation.
- In a voluntary market, a corporation looking to compensate for its unavoidable GHG emissions purchases carbon credits from an entity engaged in projects that reduce, remove, capture, or avoid emissions.
- For Instance, in the aviation sector, airlines may purchase carbon credits to offset the carbon footprints of the flights they operate.
- In voluntary markets, credits are verified by private firms as per popular standards. There are also traders and online registries where climate projects are listed and certified credits can be bought.
Compliance markets
- It is set up by policies at the national, regional, and/or international level— are officially regulated.
- Today, compliance markets mostly operate under a principle called ‘cap-and-trade”, most popular in the European Union (EU).
- Under the EU’s emissions trading system (ETS) launched in 2005, member countries set a cap or limit for emissions in different sectors, such as power, oil, manufacturing, agriculture, and waste management. This cap is determined as per the climate targets of countries and is lowered successively to reduce emissions.
- Entities in this sector are issued annual allowances or permits by governments equal to the emissions they can generate. If companies produce emissions beyond the capped amount, they have to purchase additional permit from the market. This makes up the ‘trade’ part of cap-and-trade.
- The market price of carbon gets determined by market forces when purchasers and sellers trade in emissions allowances.
- Through this kind of carbon trading, companies can decide if it is more cost-efficient to employ clean energy technologies or to purchase additional allowances. These markets may promote the reduction of energy use and encourage the shift to cleaner fuels.
- Since government-regulated trading schemes provide a clear trajectory, indicating how emission limits would be made tighter, companies will invest to innovate, and adopt cost-efficient low-carbon technologies.
- The World Bank estimates that trading in carbon credits could reduce the cost of implementing NDCs by more than half — by as much as $250 billion by 2030.
Other national and sub-national compliance carbon markets also operate around the world.