Question

17 in which decade were the first important laws passed to decrease water pollution? 1980s 1950s 1970s 1960s

Explanation:

The first important laws to decrease water pollution, such as the Clean Water Act (with significant developments and initial key legislative actions) were passed in the 1970s. The 1950s and 1960s had less comprehensive water - pollution - reducing legislation, and the 1980s was not the decade of the first important such laws.

Answer:

1970s