This document discusses the need for a global carbon pricing mechanism and carbon market to effectively address climate change. It proposes adding only a few lines to the 2015 Paris Agreement to establish a unified international carbon trading system between countries. This system would allow countries to voluntarily transfer portions of their emissions reductions to other countries in the form of carbon units, with the transfers and receipts recorded centrally. Such a small addition could create the basis for a true global carbon market that harnesses market forces to lower abatement costs and drive more ambitious climate action over time.