We present a mechanism (Climate-Just Debt Swaps) for funding climate mitigation, adaptation and "Loss and Damage." It provides an incentive for advanced economies to commit large amounts of money to climate action. The mechanism mobilises finance from both public and private sectors, includes debt restructuring and operates at a scale which is commensurate with the Paris Agreement. Climate-Just Debt Swaps provide bond markets with a channel for absorbing green and sustainable finance while offering developing nations a better deal than China's Belt and Road Initiative.