Final answer:
Humans impact the carbon cycle through activities like burning fossil fuels, removing plants, and deforestation.
Step-by-step explanation:
An example of how humans impact the carbon cycle is burning fossil fuels. When we burn fossil fuels, such as coal, oil, and natural gas, it releases large amounts of carbon dioxide (CO2) into the atmosphere. This leads to an increase in greenhouse gases, which contributes to global warming and climate change.
Another way humans impact the carbon cycle is by removing plants. Plants absorb CO2 through the process of photosynthesis, helping to balance the carbon cycle. When humans remove plants, either through deforestation or urbanization, there are fewer plants available to absorb CO2, leading to an imbalance in the carbon cycle.
Deforestation is another example of how humans impact the carbon cycle. When forests are cleared for agriculture, logging, or urban development, the carbon stored in trees is released into the atmosphere as CO2. This contributes to the increase in greenhouse gases and disrupts the natural carbon cycle.
Therefore, the correct answer is d. all of the above, as all of these actions by humans have an impact on the carbon cycle.
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