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Earth Sciences 7 Online
OpenStudy (mizuki):

The six pollutants regulated under the Clear Air Act _____ between 1970 and 2001, while energy consumption increased 42 percent. decreased 24 percent increased only 6 percent decreased 39 percent remained stable

OpenStudy (tennis5518):

I'd guess C. http://www.inc.com/encyclopedia/clean-air-act.html

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