It's been two years since 84 countries jumped on the Kyoto Protocol bandwagon, which calls for almost a total elimination of all greenhouse-producing emissions, including hydroflourocarbons (HFCs). This has caused the auto industry to reassess its standard coolant — HFC-134a. Considerable research by automakers, universities and engineers has gone into the viability of carbon dioxide (CO2) as a replacement refrigerant. The rub — CO2 features prominently in the “basket of gases” banned by ...

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