[[Paris Agreement#Mitigation provisions and carbon markets|Article 6 of the Paris Agreement]], which describes rules for an international [[carbon market]] (such as for trees in the deforestation agreement<ref name=":7" />) and other forms of international cooperation, is being discussed as it is the last piece of the rulebook remaining to be finalized.<ref name=":4">{{Cite journal |last1=Kizzier |first1=Kelley |last2=Levin |first2=Kelly |last3=Rambharos |first3=Mandy |date=2 December 2019 |title=What You Need to Know About Article 6 of the Paris Agreement |url=https://www.wri.org/insights/what-you-need-know-about-article-6-paris-agreement |journal= |access-date=19 October 2021 |archive-date=30 October 2021 |archive-url=https://web.archive.org/web/20211030050455/https://www.wri.org/insights/what-you-need-know-about-article-6-paris-agreement |url-status=live}}</ref><ref>{{cite web |title=COP 26: Implementing Article 6 of the Paris Agreement |url=https://www.edf.org/climate/implementing-paris-climate-agreement |access-date=19 October 2021 |website=Environmental Defense Fund |archive-date=28 October 2021 |archive-url=https://web.archive.org/web/20211028120548/https://www.edf.org/climate/implementing-paris-climate-agreement |url-status=live}}</ref> Although the parties have agreed in principle to avoid double counting of emission reduction across more than one country's [[greenhouse gas inventory]], exactly how much double counting will actually occur remains unclear.<ref name=":4" /> Carrying forward [[Clean Development Mechanism|pre-2020 Kyoto carbon credits]] will be discussed, but is highly unlikely to be agreed.<ref name=":5" /> Therefore, Article 6 rules could make a big difference to future emissions.<ref name=":5">{{cite web |last=Yadav |first=Kanchan |date=6 August 2021 |title=Resolution to Article 6 of Paris accord high on market's list before COP26 |url=https://www.spglobal.com/platts/en/market-insights/latest-news/electric-power/080621-resolution-to-article-6-of-paris-accord-high-on-markets-list-before-cop26 |access-date=19 October 2021 |website=www.spglobal.com |archive-date=28 October 2021 |archive-url=https://web.archive.org/web/20211028221948/https://www.spglobal.com/platts/en/market-insights/latest-news/electric-power/080621-resolution-to-article-6-of-paris-accord-high-on-markets-list-before-cop26 |url-status=live}}</ref>
