Question

which of the following explains how scientists know that current global warming is related to human activities? there wasnt carbon dioxide in the atmosphere in the past. there was more methane in the atmosphere 6,000 years ago. increased carbon dioxide in the atmosphere is not carbon - 14. there is more water vapor in the atmosphere today than the past.

Explanation:

Fossil fuel burning (human activity) releases carbon dioxide that is carbon - 14 depleted. By analyzing the carbon - 14 levels in atmospheric carbon dioxide, scientists can determine that the current increase is from human - sourced fossil fuel emissions, linking global warming to human activities.

Answer:

Increased carbon dioxide in the atmosphere is not carbon - 14.