Woody plant encroachment
Also when people use land very intensively, bush encroachment can happen. For example when farmers bring many cows to areas where wild animals lived before, these cows eat up most of the grass quickly, but do not touch the bushes. The result is that bushes occupy more and more of the land, while grasses start to disappear. Once woody encroachment has started, it is hard to stop it, even when the number of cows is made less.