Describing a method of analysis that provides information regarding the relation between the carbon dioxide content of the Earths atmosphere and global temperature
Presenting information that suggests that global temperature has increased over the last 160,000 years
Describing the kinds of information that can be gleaned from a careful analysis of the contents of sheets
Demonstrating the difficulty of arriving at a firm conclusion regarding how increases in the amount of carbon dioxide in the Earths atmosphere affect global temperature
25. It can be inferred from the passage that during periods of postglacial warming, which of the following occurred?
The total volume of air trapped in bubbles beneath the polar ice sheets increased.
The amount of deuterium in ice deposited at the poles increased.
Carbon dioxide levels in the Earth atmosphere decreased.
The amount of hydrogen in the Earths atmosphere decreased relatively the amount of deuterium.
The rate at which ice was deposited at the poles increased.
26. The author states that there is evidence to support which of the following assertions?
Estimates of global temperature that rely on measurements of deuterium in ice deposited at the poles are more reliable than those based on the amount of carbon dioxide contained in air bubbles beneath the polar surface.
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