Kyoto protocol introduced a few schemes for countries to reduce their CO2 impact. One of them is the carbon trading scheme, which allows companies to trade their rights to emit. For example, if a company did not use all of the credits, it can sell it to another company, which exceeded its pollution allowance.
Other options introduced by the Kyoto protocol is a carbon tax, which implies paying a tax for each ton of CO2 emitted in the atmosphere, and emissions cap for each company that can’t be exceeded. Since the protocol came into force in 2015, the global CO2 emissions moved into the opposite direction than was hoped – increasing even more.