Saturday, September 15, 2012

Montreal Protocol has often been called the most successful international environmental agreement .

Halon concentrations have continued to increase, as the halons presently stored in fire extinguishers are released, but their rate of increase has slowed and their abundances are expected to begin to decline by about 2020. the concentration of the HCFCs increased drastically at least partly because for many uses CFCs were substituted with HCFCs.

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