Air-con manufacturer plans to invest in CO<SUB>2</SUB> systems for cars

Manufacturers of car air conditioning systems have developed models that use an alternative coolant to the potent greenhouse gas HFC-134a. But while European and Japanese companies have developed prototypes based on carbon dioxide - with one, Valeo, confirming plans to invest in commercial production - US firms prefer HFC-152a which, while much less potent than HFC-134a, is still 140 times more powerful than CO2.

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