True or false since the 1970s, many nations have entered into treaties to control the occurrence of acid rain, the thinning of the ozone layer, and the dumping of toxic waste into oceans.

True.

Explanation:

There has been a lot of occurrence and research about the thinning of the ozone layer and toxic waste in the water that has dated back to since the 1970s. It is true.

answer; /// the above statement is (true);

answer; illegible handwriting;