webbjalia04
webbjalia04
12.03.2022 • 
Biology

CFCs can act as greenhouse gases and as chemicals that reduce the ozone levels in the stratosphere. A worldwide ban on CFCs in 1987 was enacted as part of the Montreal Protocol. However, according to the graph, the level of CFCs did not significantly decrease after 1990. Which statement best explains the level of CFCs after 1990?

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