Article 6 of the Paris Agreement consists of nine paragraphs providing principles for how countries can “pursue voluntary cooperation” to reach their climate targets.  These high-level principles were intended as a basis for countries to develop detailed rules on how to implement Article 6 in practice. However, they proved contentious, leading to years of delays. At COP 26 in Glasgow in 2021, following several years of inconclusive negotiations, countries agreed on a package of rules to govern and implement international carbon market mechanisms under the United Nations Framework Convention on Climate Change (UNFCCC).