Which of the following statements about u. s. environmental policy is not true?
a. before earth day 1970, no one in the united states cared about the environment.
b. during the 1960s, several individuals had strong effects on public thinking about environmental issues.
c. during most of the 19th century, most americans were not concerned about environmental consequences.
d. the environmental protection agency was established at a time of increasing public awareness of environmental problems.