On which part of the carbon cycle have humans had the greatest impact? storage of co2 in the oceans all of the answer options have been greatly impacted by humans. return of co2 to the atmosphere by burning of ancient organic matter deposition of organic carbon in deep sea sediments capture of atmospheric co2 by chemical weathering of rocks

The carbon cycle is the flow of carbon in the spheres of the planet. Return of to the atmosphere by burning organic matter has the greatest impact.

The carbon cycle is the continuous flow and the movement of carbon and its compounds in the atmosphere and the other spheres of the planet. The ancient organic matter is the fossil fuels that are used as energy sources for various purposes.

The burning of the fossil fuels like coal, petrol and diesel are used as power sources to drive machines, vehicles and engines. The burning of these fossil fuels leads to the release of a large amount of carbon dioxide in the atmosphere and increases its concentration in greenhouse gases.

This increase in the carbon dioxide in the atmosphere leads to global warming as the increased concentration of these gases leads to a rise in the temperature of the planet's surface.

Therefore, option C. return of the carbon dioxide to the atmosphere will have the greatest impact.

Learn more about the carbon cycle here:

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it's all four options.