A bank carbon restriction is a law that bars banks from lending money to companies most responsible for the burning of fossil fuels, such as companies involved in oil production or refinement, coal production or companies that own power plants that burn coal or natural gas. With a bank carbon restriction in effect any bank that violated this ban will have their banking license revoked for a period of time and their access to the central bank’s discount window taken away. Such restrictions would speed the transition toward solar and wind energy.