A central factor that has prevented the acknowledgment of the environmental and energy efficiency benefits of natural gas and propane is the persistent use of site energy and carbon emissions measurements rather than total source-to-site energy and emissions. Existing site-based methods fail to capture the total societal benefits of direct gas and propane use.
Since CMIC began work in 2007, building codes and standards have begun to incorporate full fuel cycle ("source-to-site") metrics. This is a significant departure from past trends of relying on site-based metrics. Organizations and programs that have begun to utilize a full fuel cycle approach include:
National Academy of Sciences recommendation for use of full fuel cycle measurements
ASHRAE Building Labeling Program
Department of Energy Notice of Proposed Rulemakings to incorporate full fuel cycle energy use and emissions in multiple standards
Environmental Protection Agency's Portfolio Manager, Target Finder, and ENERGY STAR for Buildings programs
U.S. Green Building Council LEED for Existing Buildings
International Green Construction Code