Answer
The CO2 level of the atmosphere has been increasing over the past 200 years primarily due to human activities, particularly the burning of fossil fuels (such as coal, oil, and natural gas) for energy, industrial processes, and transportation. These activities release vast amounts of CO2 into the atmosphere, significantly contributing to the rising concentration of carbon dioxide. Deforestation and land-use changes are also contributing factors, as forests act as carbon sinks, absorbing CO2 from the atmosphere. When forests are cleared or burned, this stored carbon is released back into the atmosphere as CO2.
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