Why is there a cap on production and import of HCFCs?
HCFCs are substances the deplete the ozone layer. In 1992, the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer (Protocol) established a limit (cap) on the combined production and import of hydrochlorofluorocarbons (HCFCs) for industrialized countries; this went into effect in 1996. A stepwise phaseout schedule was also agreed to: a 35% reduction from the cap in 2004; a 75% reduction in 2010 (adjusted in Sept 2007 from 65%); a 90% reduction in 2015; a 99.5% reduction in 2020; and a total phaseout in 2030. The Parties to the Protocol decided in 1999 to establish a separate cap on production to take effect in 2004 and follow the same schedule as the consumption phaseout. Why are certain HCFCs singled out for accelerated phaseout in the U.S. and what is that schedule? The U.S. has used a “worst first” approach to phaseout HCFCs with the highest ozone depletion potentials (ODPs) earliest. The HCFCs with the highest ODPs are HCFC-141b, HCFC-22, and HCFC-142b. Ther
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