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Which of the following explains how scientists know that current global warming is related to human activities?
Atmospheric carbon has increased much faster than in the past.
There were no greenhouse gases in the atmosphere in the past.
There was more methane in the atmosphere 6,000 years ago.
There is more water vapor in the atmosphere today than the past.
By comparing the observed and modeled patterns, scientists can positively identify "human fingerprints” and attribute a proportion of observed warming to human activities. These fingerprints are found in a diverse range of records from the atmosphere, the ocean, and Earth's surface
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