Currently, a number of green building rating systems exist throughout the world but there is no international standard. The leading rating systems per ClimateChangeCorp.com
include the United Kingdom’s Building Research Establishment’s Environmental Assessment Method (BREEAM), Australia’s Green Star program, and the United States’ Leadership in Energy and Environmental Design (LEED).
LEED certification, which is offered by the U.S. Green Building Council, rates how a building was built. The United States also has Energy Star, a technical assistance program that provides tools and resources to help evaluate energy performance and reduce energy use and greenhouse gas emissions.
The lack of an international standard may soon change. BREEAM, LEED and Green Star have agreed to develop common metrics for measuring CO2 emissions. This initial step will help international property developers and building owners monitor the energy performance of their global asset portfolio.Space Jam film



