Multiple choice

A primary reason we know that human activity is causing global warming is:

  1. CO2 has decreased in the atmosphere over the past ten years

  2. Earth's atmosphere is getting thinner

  3. We can correlate the rise of CO2 with human activities

  4. All answer choices are accurate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Scientists can trace the rise of atmospheric carbon dioxide directly to human activities, such as burning fossil fuels, through isotopic analysis and historical emissions data. This correlation, along with physical models, confirms that human actions are driving modern global warming.

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