Middle School Earth and Space Science Quiz
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EARTH AND HUMAN ACTIVITY
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Two students propose explanations for the same set of evidence from 1900–2020:
- Human activity data: CO2 emissions rise slowly early in the century, then rise much faster after 1950.
- Climate indicators: global average temperature rises most strongly after 1950; mountain glaciers retreat more rapidly after 1950.
- Temporal alignment: the biggest changes in climate indicators occur when emissions increase fastest.
Student 1: "Human activities increased greenhouse gases, which contributed to warming and glacier retreat."
Student 2: "Glaciers melted first, and that caused people to burn more fossil fuels later."
Which comparison is best supported by the evidence?
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