Which of the following is not one of the major environmental problems resulting from human interference in the nitrogen cycle?

Ozone depletion is not counted among the major environmental problems arising from human interference in the nitrogen cycle.

Global warming from released nitrous oxide is a genuine nitrogen-cycle problem, as nitrous oxide is a potent greenhouse gas.

Acid rain is a genuine consequence, driven by nitrogen oxides in the air.

Eutrophication is a genuine consequence, as excess nitrogen enriches water bodies.

The standard trio of nitrogen-cycle harms is global warming, acid rain and eutrophication.

Nitrogen fertiliser overuse is the chief way humans overload the cycle.