What do scientists estimate is the approximate age of earth ?
a. 660 million years
b. 3.5 billion years
c. 4.6 billion years
d. 12.2 billion years

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

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