human beings are adversely affecting our biological environment give reason in support of your answer and also suggest some measures to conserve natural vegetation

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal

What is the thickest layer of earth called?