The graph shows ice core data that illustrate historical trends in the amount of carbon dioxide in Earth's atmosphere. Scientists attribute global warming
to recent increases in human activities that produce carbon dioxide. Which
kind of data would show that a new solution to the problem of global
warming is working?

A. Historic atmospheric CO2 levels would be the same as current
levels
B. Current atmospheric CO2 levels would be increasing at a steady
rate.
C. Historic atmospheric CO2 levels would no longer appear to
increase over time.
D. Current atmospheric CO2 levels would be increasing more slowly.