The organizations responsible for the world’s three leading environmental assessment systems for buildings have agreed to establish consistent methods for measuring and reporting carbon dioxide (CO2) emissions. The U.K.-based Building Research Establishment (BRE) Trust, the U.S. Green Building Council (USGBC), and the Green Building Council of Australia, plan to "map and develop common metrics to measure emissions of CO2 equivalents from new homes and buildings.” Along with the UK Green Building Council, the three groups, which administer the BREEAM, LEED, and Green Star rating systems respectively, signed a memorandum of understanding at the Ecobuild conference held in London earlier this