WARREN, MI - General Motors announced it will introduce a new greenhouse gas-friendly air-conditioning refrigerant in 2013 Chevrolet, Buick, GMC, and Cadillac models in the U.S. to keep vehicle interiors cool while reducing heat-trapping gases in the atmosphere by more than 99 percent.

GM said the biggest benefit of the new refrigerant, (HFO-1234yf) supplied by Honeywell, is that it breaks down faster in the atmosphere than the refrigerant currently used (R-134a). On average, R-134a refrigerant has an atmospheric life of more than 13 years, giving it a global warming potential (GWP) of more than 1,400, according to GM. In comparison, the new refrigerant lingers in the atmosphere for just 11 days and has a GWP of only 4, a 99.7 percent improvement.

GWP is a value used to compare different greenhouse gases that trap heat in the atmosphere. The base measurement for GWP is relative to that of carbon dioxide (CO2).  

The U.S. Environmental Protection Agency awards regulatory credit for the improved environmental performance of the new refrigerant, which helps GM meet the overall requirements of the EPA's new motor vehicle greenhouse gas regulations. The new regulation requires an overall 40-percent improvement in overall U.S. fleet average vehicle fuel economy by 2016. The use of HFO-1234yf will help GM vehicles significantly exceed its targets under the new regulations.