Increased levels of carbon dioxide in earth's atmosphere will definitely result in increased crop yields.
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Q24: Concerns about greenhouse-effect heating relate not only
Q25: The changes in permafrost has very little
Q26: It is difficult to determine the effect
Q27: The term "greenhouse effect" refers to an
Q28: If all the polar ice sheets were
Q30: Slowing the destruction of tropical rain forests
Q31: Global warming is not uniform throughout the
Q32: Studies of cores from polar ice sheets
Q33: The plants and animals that will be
Q34: The principal source of rising levels of
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