Final answer:
Human activity alters the carbon cycle by releasing carbon dioxide through fossil fuel burning and by reducing carbon absorption through deforestation.
Explanation:
Human activity significantly impacts the carbon cycle through actions such as burning fossil fuels and deforestation. Fossil fuel combustion releases carbon dioxide (CO2) into the atmosphere, contributing to global warming. Deforestation diminishes the capacity of trees to absorb CO2 from the atmosphere during photosynthesis, leading to a rise in atmospheric carbon dioxide levels.
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