This document discusses the future of carbon markets following the Cancun climate talks. It suggests that while there was little appetite for a top-down framework, countries may establish top-down emission reduction targets met through bottom-up mechanisms like emissions trading schemes and offset programs. The Clean Development Mechanism is unlikely to deliver large emission cuts and new market mechanisms aim to scale up reductions beyond pure offsetting. A bottom-up evolution of linked domestic carbon markets could emerge without a binding international agreement if countries commit to transparency and mitigation efforts. Key issues for this approach include accounting, reporting, and criteria for traded units.