Final answer:
Burning fossil fuels and photosynthesis by plants both affect carbon dioxide levels in the atmosphere.
Explanation:
Burning fossil fuels is a process that would increase the amount of carbon dioxide in the air. When fossil fuels are burned, they release carbon dioxide into the atmosphere, contributing to the elevated levels of CO2.
Another process that increases carbon dioxide levels is photosynthesis by plants. While plants absorb carbon dioxide during photosynthesis, the burning of fossil fuels far surpasses the rate at which plants can remove CO2, leading to a net increase in atmospheric carbon dioxide.
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