Question

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

Explanation:

Fossil fuels contain carbon. When burned, this carbon is released as carbon - containing gases like carbon dioxide into the atmosphere. It is not removed from the atmosphere, added to the carbon cycle in a way that implies a new addition (it was already part of the cycle in fossil form), and carbon cannot be destroyed according to the law of conservation of mass.

Answer:

A. Carbon is released into the atmosphere.