A market aimed at individuals or companies who voluntarily seek to reduce or offset their greenhouse gas emissions. It generates a little over $2,000,000,000.00 (two billion dollars) annually. It is estimated that this model will virtually cease to exist in Brazil by 2030/2035 because, with the implementation of the SBCE, we will have a flow of production for the mandatory market, or public, in Brazil and abroad.

Compulsory, it is imposed by the State on GHG emitters to reduce their emissions and/or offset them by purchasing carbon credits through certificates traded on the Stock Exchange. For example, the C-Bio. PL 412/2012 brings the need for all companies to issue their emission reports or GHG inventories within 12 months after promulgation. At this point, companies that do not emit above 10,000 tonnes/year of GHGs are exempt. Those emitting between 10,001 and 25,000 t/year must comply and reduce emissions, with internal projects and improvements or external projects aimed at sequestering "carbon" from the atmosphere. And those emitting above 25,001 tonnes/year, in addition to compliance processes, will be required to purchase carbon credits on the stock exchange.