Fossil aren't the only cause of global warming. Many human activities are causing global warming. Most come from the combustion of fossil fuels in cars, factories and electricity production.
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I personally believe that the right answer is C. Other overpopulation results in more living organisms, and since the pollution has intoxicated the living, they die releasing the carbon into the soil. So there is high amounts of carbon and less of the organic compounds because the overdose on carbon.
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Simply put, the more rural one is, the worse the internet access is. The more urban, the better.
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