Ozone-protection treaty had climate benefits, too
The 1987 Montreal Protocol phased out the use of chloroflourocarbons, or CFCs, a class of chemicals that destroy ozone in the stratosphere, allowing more ultraviolet radiation to reach earth's surface.
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#1 Aug 7, 2013
One class of refrigerant with a very low GWP is (HFO-1234yf) otherwise known as 2,3,3,3-Tetrafluoropropene as a drop in replacement for R134a refrigerant, one of the most widely used refrigerants in cars, blowing agents, fire suppression, aerosol propellant etc.
Large, stationary units utilizing R22 are transitioning to
R-744 (CO2)(low efficiency)
R-717 (Ammonia)(toxic leaks)
R-1270 (Propylene).(fire hazard)
More research needed there. But I have faith that a good drop in replacement will be found with a low GWP.
#2 Aug 7, 2013
Note: One thing I omitted is that high efficiency is ALSO an issue of GWP since the energy input is often generated from coal. This indirect GWP should be included in any assessment.
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