despite the 1987 international agreement known as the Montreal Protocol,which calls for a phaseout of chlorofluorocarbons and other ozone depleting chemicals by the year 2006.

• 尽管在1987年国际间曾达成协定，呼吁逐步淘汰氟利昂制冷剂与其他破坏臭氧的化学物质，以公元2006年为底线。