5. If present trends continue in growth of atmospheric greenhouse gases, the range by which the earth’s surface temperatures will rise by 2100 is closest to which of these?
A. 20C–40C B. 40C–60C C. 60C–80C D. 80C–100C E. 100C–120C

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Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;