The CDM, established under the Kyoto Protocol of the UNFCCC, is the largest global offset (or crediting) mechanism for greenhouse gases (GHGs). It provides the framework for developing country projects that reduce, avoid or sequester carbon emissions to earn Certified Emission Reductions (CERs)—tradable offsets (also called carbon credits) which can be sold to enhance a project’s financial viability https://cdm.unfccc.int/faq/index.html. Another Kyoto mechanism, Joint Implementation (JI) https://ji.unfccc.int/index.html, similarly provides for Emission Reduction Units (ERUs) to be sold by economies in transition
On 23 September 2019, the Secretary-General of the United Nations will host the Climate Action Summit in New York with the objective of boosting ambition and rapidly accelerate action to implement the Paris Agreement https://www.un.org/en/climatechange/