Although the diagram is missing in this question, we can confirm that two major sources of atmospheric carbon are the use of fossil fuels and the natural ocean-atmosphere exchange.
The most harmful of the sources mentioned is the one caused by humans. The burning of fossil fuels such as the oil we use to power cars and other motor vehicles adds tons of carbon into the atmosphere every day.
On the other hand, there are also naturally occurring sources for atmospheric carbon, such as the ocean or the respiration process of animals.
Therefore, we can confirm that two major sources of atmospheric carbon are the use of fossil fuels and the natural ocean-atmosphere exchange.
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