Final answer:
Carbon dioxide (CO₂) has increased over time due to human activities like burning fossil fuels, leading to global warming.
Explanation:
Carbon dioxide (CO₂) is the gas in Earth's atmosphere that has increased over time due to burning fossil fuels. Since the industrial revolution, human activities such as burning fossil fuels have significantly added carbon dioxide to the atmosphere, contributing to global warming.
Learn more about Greenhouse Gases here:
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