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Questions and Answers
What is the main cause of the current warming trend?
What is the main cause of the current warming trend?
- Natural processes
- Human activities (correct)
- Changes in the Sun's energy output
- Volcanic activity
What has occurred as a result of the extra energy trapped in the Earth system?
What has occurred as a result of the extra energy trapped in the Earth system?
- Changes in the atmosphere only
- Changes in the ocean only
- No changes have occurred
- Widespread and rapid changes in the atmosphere, ocean, cryosphere, and biosphere (correct)
When was the heat-trapping nature of carbon dioxide and other gases first demonstrated by scientists?
When was the heat-trapping nature of carbon dioxide and other gases first demonstrated by scientists?
- Mid-1800s (correct)
- Mid-2000s
- Mid-1700s
- Mid-1900s
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