Multiple Choice
It is generally believed that humans began to significantly modify the environment about how long ago?
A) 8 Ka, near the start of agricultural-based societies
B) 4-5 Ka, near the "dawn of civilization"
C) 2 Ka, the birth of Christ
D) ~250 years ago, during the Age of Industrialization
Correct Answer:

Verified
Correct Answer:
Verified
Q6: Global warming has caused Earth to become
Q9: On what time scale does albedo change?<br>A)
Q10: A blogger writes that global warming is
Q11: The discovery that the amount of solar
Q13: In an earlier chapter you learned that
Q15: Some plankton make shells of calcite/aragonite,that is,CaCO₃.They
Q16: Which of the following inputs from outside
Q17: With the increased amount of information that
Q18: During most of the Mesozoic,Earth was _.<br>A)
Q19: Which two features on the figure below