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United Nations Environment Programme ,  [Votre planète a besoin de vous: Des initiatives concretes - Notre Planète Mai 2009, Tu Planeta Te Necesita: Medidas Prácticas - Nuestro Planeta Mayo 2009] ,  [Your Planet Needs You: Practical Action - Our Planet May 2009] ,  Your Planet Needs You: Practical Action - Our Planet May 2009

United Nations Environment Programme ,  [Common carbon metric for measuring energy use and reporting greenhouse gas emissions from building operations] ,  Common carbon metric for measuring energy use and reporting greenhouse gas emissions from building operations