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MMLU / Earth has been gradually warming over the past few decades. Based on a great…

Problem

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question

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

choices

  1. human activities that are increasing the concentration of greenhouse gases in Earth's atmosphere
  2. the fact that our politicians spout a lot of hot air
  3. the human release of chemicals called CFCs into the stratosphere
  4. the increase in forest fires during recent years

subject

astronomy

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Source and history

Official source

initial import