What has changed over the last century that makes scientists believe the rise in average global temperature is not just a normal temporary fluctuation?
A) The amount of water vapor in the atmosphere has increased.
B) The amount of carbon dioxide in the atmosphere has increased.
C) The amount of sunlight heating Earth has increased.
D) The amount of heat going back out into space has increased.
E) The amount of forested land has increased.
Correct Answer:
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