Samples of pollen taken from ________ cores in lake beds have allowed scientists to reconstruct the vegetation of many regions of the past 20 000 years.
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Q2: Deforestation is a major cause of the
Q4: _ levels were about 100 metres lower
Q5: According to general circulation models,warming is expected
Q6: Albedo, an index of the ability of
Q8: General circulation models consistently predict an increase
Q9: Atmospheric scientists have developed complex computer models
Q10: In response to an increase in atmospheric
Q11: The absorption of thermal (long-wave)radiation emitted by
Q11: Plants exposed to higher atmospheric carbon dioxide
Q17: The process of _ controls uptake of
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