This statement can be explained by the example of “Himalayan National Park”. Long before the formation of this park, the local population and the nomadic shepherds used to graze their cattle in the alpine meadows. But, after the formation of this park, the locals were restricted to use the forest and this practice of grazing was stopped. However, this proved to be harmful for the sustainability of the forest. The practice of grazing helped to control the height of the grass there. The growth of the grass was badly affected. Without grazing, the grass grew very tall and consequently prevented the growth of fresh grass.