How is the clean air act of 1970 related to a principle established by the supreme court in the 1800s? the clean air act was overturned through judicial review.

The Clean Air Act is based on an implied power of Congress. Although other branches of the government sometimes do not agree with the fact that it is federally governed by a state agency and funded federally, it was established by the Congress according to a supreme court decision from the 1800s. Congress enacted the Clean Air Act of 1970  because they are concerned about the growing quality of our country's air resources. Since this act came in force it becomes controversial between Environmental groups and businessmen.

the us constitution is a living document, meaning that it can be changed over time as the country changes.

social contract theory basically says that all individuals are born equal, and provided a god given right to consent to be governed. american government is based of this

thomas hobbes and john locke said that we are selfish, individualistic, and constantly at war with each other, therefore we need to be controlled. 

government is defined as the legitimate use of force to control human behavior within territorial boundaries, here comes in hobbes and locke.

hobbes takes the part about controlling human behavior. while locke takes the part of legitimate use of force, since force is not legitimate unless there is consent of the people. 

there are basically 3 goals of the government: 1) maintain order by protecting life and property. 2) providing public goods, those which are typically not provided by the public sector, such as roads and education. 3) promote equality be it political, opportunist or outcome equality.