A Theory of Carbon Currency

We propose a new international monetary system based on carbon currency (the carbon standard) to tackle two pressing externalities in today's global economic and political context: the dangerous and irreversible effects caused by unconstrained green-house gas emissions and the cost to the rest of the world as a result of the U.S. dollar being the dominated global currency and the U.S. Federal Reserve increasingly implementing monetary policies not aligned with the global common interest. We define carbon currency as standardized carbon-related securities backed up by the right of one unit of carbon emissions. It can be used as a new global reserve currency and functions as an international unit of account. Through the trading of carbon currency, efficient carbon prices are established. By incorporating the cost of carbon emissions into decision making, carbon pricing provides incentives for countries to pursue low-carbon growth, which helps achieve the net zero emissions global goal set under the 2015 Paris Agreement. Under the carbon standard, the external shocks to the international financial system would come from variations of carbon emissions rather than the U.S. monetary policies. As such, monetary authorities’ commitment to maintaining stable exchange rates comes together with monetary policies aiming at pursuing low-carbon growth. The new system potentially poses a plausible solution to the classical Mundellian Trilemma because the objectives of maintaining fixed exchange rate and implementing monetary policy become one. Although several hurdles are constraining the launch of carbon currency immediately, the carbon standard poses a feasible international monetary system as the world-wide campaign to achieve carbon neutrality progresses.