Carbon trading is the process of buying and selling permits and credits that allow the permit holder to emit carbon dioxide. It has been a central pillar of the EU’s efforts to slow climate change.
The model used in all current carbon trading schemes is called ‘cap and trade’. In a ‘cap and trade’ scheme, a government or intergovernmental body sets an overall legal limit on emissions (the cap) over a specific period of time, and grants a fixed number of permits to those releasing the emissions. A polluter must hold enough permits to cover the emissions it releases. Each permit in the existing carbon trading schemes is considered equivalent to one tons of carbon dioxide. In the model, permits are to be sold – usually by auction – so that from the outset, polluters are forced to put a price on their emissions, and are incentivized to reduce to a bare minimum the permits they seek.
Carbon Credit is the currency of Carbon Trading, generally we call Credits. Example- Like normal trading occur between MONEY similarly carbon trading occurs between CREDITS. Example- if some company/organization has emitted 1000 tons of CO2 and that company wants to compensate this 1000 tons of CO2 - how do they do that ? They'll compensate 1000 tons of CO2 by purchasing 1000 credits. These buying & selling of carbon credit is called Carbon Trading.