Ecologists Using Global Carbon-Balance Models Were Overestimating the Rate of Increase

Multiple Choice

Ecologists using global carbon-balance models were overestimating the rate of increase of atmospheric carbon dioxide. This discovery led these ecologists to

A) discard their models.
B) switch to modeling other phenomena.
C) conclude that increase in atmospheric carbon dioxide is not a serious environmental problem.
D) search for evidence of other carbon dioxide sinks in the global cycle of carbon.