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Your right about it being more of a green house gas than CO2. That is why many or all refrigerants are controlled. R12 refrigerant was banned because it broke down the ozone layer in the atmosphere, but the newer refrigerants are bad for global warming if released directly int o the atmosphere. The od thing about this is that refrigerants are controlled, but there is nothing stopping you from emptying your propane tank int o the atmosphere. The effects are just as bad. Propane makes a good refrigerant, but because of it's ability to burn, it's banned from use in that way because of the treat of explosion if it leaks.
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