The Climate Registry

The Climate Registry is a nonprofit collaboration among North American states, provinces, territories and native sovereign nations that sets consistent and transparent standards for calculating, verifying and publicly reporting greenhouse gas emissions. Massachusetts and most other U.S. states - along with a majority of Canadian provinces, a number of Mexican states and several native American tribes - have signed The Climate Registry's statement of goals and principles.

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The Climate Registry web site

Why States Created a North American Greenhouse Gas Registry

Article from the November 2008 issue of EM, the Air & Waste Management Association magazine.
NESCAUM web site