# Result of deterioration of vegetation

I had this question in my previous exam, it says:

Deterioration of vegetation resulted by overgrazing results in......

1.desert encroachment.

2.change in climate.

I had to choose 1 or 2 and I chose 2, why? Because my textbook says:

Overgrazing results in deterioration of natural flora, which is always accompanied by deterioration of soil and local climate.

But my answer was wrong, and I was confused which one to choose because both of them seem as correct answers. What I understand from my text book is that deterioration of vegetation has a direct effect i.e. change in climate and an indirect effect i.e. desert encroachment. So, why was my answer wrong?