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9 April, 02:35

When did the worldwide response to ozone depletion begin? Select one: a. 1940s and 1950s b. 1960s and 1970s c. 1970s and 1980s d. 1980s and 1990s

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  1. 9 April, 04:59
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    d. 1980s and 1990s

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    These concerns led to the adoption of the Montreal Protocol in 1987, which bans the production of CFCs, halons and other ozone depleting chemicals. The ban came into effect in 1989. Ozone levels stabilized by the mid 1990s and began to recover in the 2000s.
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