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(1) HFCs are chemicals invented as a substitute for CFCs and HCFCs - ozone-destroying gases that are being phased out worldwide. HFCs are mainly used in the refrigeration and air conditioning industries. On average, over 20 years one ton of HFC has 3,300 times more global warming potential than one ton of carbon dioxide.
In 1997, the United Nations Kyoto Protocol on Climate Change was extended to include HFCs, identifying them as potent greenhouse gases whose emissions must be reduced by industrialised countries.
(2) The Environmental Guidelines for the Sydney Olympic Games call for the use of HFC-free refrigerants and processes.
(3) Greenfreeze uses a mixture of hydrocarbon gases propane (R290) and isobutane (R60Oa), or isobutane as a pure gas, for the refrigerant, and cyclopentane for blowing the insulation foam. Since 1992, Greenfreeze has become the dominant technology in Western Europe, having taken over nearly 100 percent of the German refrigeration market.
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