Congress passed legislation protecting the environment starting in the 1960s and 1970s
a. to prevent damage to our air, water, and ground before it occurred.
b. because it had nothing else to do.
c. in response to a united nations directive.
d. because the air and water had become so contaminated that it was having serious consequences

23. how does specialization among nations encourage interdependence? nations work together to share labor and resources to produce vital goods. nations sign treaties prohibiting taxes on imports. nations produce specific goods and then trade to obtain things they need. nations that are more developed agree to fund development in nations with limited industry.