China has played a leading role in cutting greenhouse gas emissions and providing carbon credits under a United Nations-backed trading scheme. According to the World Bank, China was involved in 73% of deals made under the Kyoto Protocol's Clean Development Mechanism (CDM) in 2007, and 84% in 2008, ranking first in the world. Under the CDM, if developed countries invest in clean energy projects in developing countries, they can receive Certification of Emission Reduction (CER) in return. They can then sell the CERs for profit, or use them to meet the emission targets under the Kyoto Protocol.
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