This paper examines international experience with Measurement, Reporting, and Verification (MRV), which has focused on accounting of greenhouse gas (GHG) emissions at the national and project levels. National reporting of emissions has centered on the preparation of national communications which are required every four years for developed countries. While national communications are currently voluntary for developing countries, they will be required every four years under the Cancun Agreements. Project level MRV has centered on projects proposed by developing countries under the Clean Development Mechanism (CDM) and includes detailed emissions reporting and verification.

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