Arrhenius was not particularly alarmed by his discovery at the time. What changed that made later scientists become much more concerned about the climate effects of carbon dioxide?
A. Emissions of carbon dioxide rose much faster than Arrhenius had anticipated.
B. Scientists discovered errors in Arrhenius’s calculations that made the effects of carbon dioxide much greater than he had expected.
C. Scientists became concerned about carbon dioxide only after measurements showed the world was warming substantially.
D. Scientists discovered that there is much more natural carbon dioxide in the atmosphere than Arrhenius had thought.
Answer: A. Emissions of carbon dioxide rose much faster than Arrhenius had anticipated.
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