Although Chloroflurocarbons (CFCs) and various other related chemicals are being phased out as they damage the ozone layer, it has been more than difficult to find a suitable and commercially feasible replacement for them in car air conditioning. Daimler-Benz, Germany's automobile giant, is now testing an air conditioner that uses compressed carbon dioxide instead. The gas was used in the earlier refrigerators, but abandoned since it needs very high pressure. However, with modern materials, this is no longer a problem, claim researchers.
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