Question

what happens when humans burn fossil fuels? carbon is destroyed. carbon is added to the carbon cycle. carbon is removed from the atmosphere. carbon is released into the atmosphere.

Explanation:

When humans burn fossil fuels, carbon - which was stored in the fossil fuels - is released into the atmosphere as carbon dioxide. Carbon is not destroyed as matter is conserved according to the law of conservation of mass. It is not added to the carbon cycle in the sense that it was already part of the cycle in a stored form in fossil fuels, and it is not removed from the atmosphere in this process but rather added to it.

Answer:

Carbon is released into the atmosphere.