Question

The diagram shows different pathways of carbon in the carbon cycle. If humans increase the burning of fossil fuels, which of the following outcomes is the most likely effect on the balance of carbon in the atmosphere, plants, and oceans?

(1 point)

Carbon dioxide in the atmosphere will decrease because plants will absorb all of it.

Carbon dioxide in the atmosphere will increase, which can lead to more carbon dissolving in the ocean.

Carbon dioxide in the atmosphere will remain the same because the carbon cycle is balanced.

Carbon dioxide in the atmosphere will decrease because animals release less carbon.

Answer 1

Carbon dioxide in the atmosphere will increase, which can lead to more carbon dissolving in the ocean.

Burning fossil fuels releases stored carbon as CO2 faster than plants and oceans can remove it, raising atmospheric CO2; some of that extra CO2 dissolves in the oceans, causing ocean acidification.