Earth Has Been Gradually Warming Over the Past Few Decades

Earth has been gradually warming over the past few decades. Based on a great deal of evidence, scientists believe that this warming is caused by ________.

A) human activities that are increasing the concentration of greenhouse gases in Earth's atmosphere
B) the increase in forest fires during recent years
C) the human release of chemicals called CFCs into the stratosphere
D) the fact that our politicians spout a lot of hot air

Correct Answer:

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