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In the second half of the 2oth century, federal
efforts to reduce air and water pollution included
(1) imposing limits on the number of imported
automobiles
(2) increasing domestic coal production
(3) placing limits on factory emissions
(4) encouraging United States corporations to
move operations overseas


Sagot :

In the second half of the 20th century, federal efforts to reduce air and water pollution included "(1) imposing limits on the number of imported automobiles" among other things.