Currently, the concentration of carbon dioxide in Earth's atmosphere is about 400 parts per million. During the Cretaceous Period, about 110 million years ago, the concentration of carbon dioxide in Earth's atmosphere was about 2,000 parts per million. Based on your knowledge of the greenhouse effect, how do you think the average temperature on Earth 110 million years ago compared to the temperature in modern times?
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Currently, the concentration of carbon dioxide in Earth's atmosphere is about 400 parts per million....
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