1. It has been suggested that global warming over the past 40 years might have been even greater…

1. It has been suggested that global warming over the past
40 years might have been even greater were it not for the effect of certain
types of air pollution. Explain how this could be true.

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2. Why is classification often a necessary task in science?

3.  What climate data are needed to classify a climate using
the Köppen scheme?

4.  Should climate boundaries, such as those shown on the
world map in Figure 15–4, be regarded as fixed? Explain.