There are some people who cool their cars down with ice, but General Motors thinks drivers like standard air conditioning. Since the refrigerant used in most automotive air conditioning systems is not good for the environment, GM is proud to announce it will use a better type of refrigerant (called HFO-1234yf) in its vehicles that it says only stays in the atmosphere for 11 days. The standard R-134a refrigerant, GM says, has an atmospheric life of more than 13 years. This is bad because, as Wiki says:
That GWP in the sentence above stands for "global warming potential," and is based on the GWP measurement relative to CO2. Higher numbers are worse and GM's new refrigerant has a GWP of just 4 (yes, four), a huge improvement. The EPA approves of the use of HFO-1234yf and GM will be able to "significantly exceed" new motor vehicle greenhouse gas regulations thanks to regulatory credits the EPA will issue. Press release after the jump.[R-134a] has insignificant ozone depletion potential (ozone layer), significant global warming potential (100-yr GWP = 1430) and negligible acidification potential (acid rain).
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