In an Earlier Chapter You Learned That Geologists Are Taught

Multiple Choice

In an earlier chapter you learned that geologists are taught that "The Present is the Key to the Past." In studying paleoclimate,why would this idea probably be wrong?

A) because we do not have detailed records of the climate for more than the last 4000 or so years of recorded history
B) because the fundamentals of the carbon cycle have changed
C) because of the decrease in volcanic eruption since the start of recorded history
D) because of the many ways that humans are indirectly or directly affecting climate.