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By wiping out the use of CFCs, the Montreal agreement inadvertently helped to birth a new greenhouse gas, one that is up to 4,000 times more potent than carbon dioxide and entirely man made: hydroflurocarbons, or HFCs. Although they didn't punch a hole in the ozone layer, these replacement chemicals do have an acute warming effect and, worryingly, their use is growing at a rate of 10-15 percent a year worldwide. [Source: Thomson Reuters]
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