II. We are unable at present to measure global temperature changes precisely.
III. The most important cause of regional climatic fluctuations is the change in CO2 levels in the atmosphere.
I only
III only
I and II only
II and III only
I, II, and III
27. All of the following can be found in the author s discussion of climate EXCEPT
a statement about the effects of increased volcanic activity on the Earth s temperatures
an indication of the effect of an increase in water vapor in the atmosphere
a contrast between two theories about the effects of a lowering of CO2 levels in the atmosphere
a generalization about the efficiency of meteorological recording stations
a hypothesis about the relationship between atmospheric gases and changes in climate
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