The amount of deuterium in the Earths atmosphere tends to increase as global temperature decreases.
Periods of postglacial warming are characterized by the presence of increased levels of carbon dioxide in the Earths atmosphere.
Increases in global temperature over the last 160,000 years are largely the result of increases in the ratio of deuterium to hydrogen in the Earths atmosphere.
Increases in global temperature over the last 160,000 years have been accompanied by decreases in the amount of deuterium in the ice deposited at the poles.
27. It can be inferred from the passage that the conclusion stated in the last sentence would need to be reevaluated if scientists discovered that which of the following were true?
The amount of deuterium in ice deposited on the polar surface is significantly greater than the amount of deuterium in ice located deep beneath the polar surface.
Both the air bubbles trapped deep beneath the polar surface and the ice surrounding them contain relatively low levels of deuterium.
Air bubbles trapped deep beneath the polar surface and containing relatively high levels of carbon dioxide are surrounded by ice that contained relatively low levels of deuterium.
The current level of carbon dioxide in the Earths atmosphere exceeds the level of carbon dioxide in the prehistoric air trapped beneath the polar surface.
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