A two-day sleep-deprived sprint of negotiations at the end of the world’s longest climate talks wasn’t enough for countries to agree on rules for an international carbon market.

Nations are already bracing for tense climate talks in 2020 as they also leave the two-week meeting in Madrid without a deal on how a mechanism to provide funding to developing countries for the losses and damages they experience from climate change should be governed. How that issue is decided will ultimately determine if the United States, which is in the process of pulling out of the Paris Agreement, will have to give money regardless.