Q1) How did the tribals in the Himalayan national park affect sustainable practices?

Prior to the formation of National park in this region the Pastoralists would use this region as it contained alpine meadows  for grazing their sheep which would not allow over growth of the grass.But after the formation of Himalayan National park this grazing practise was put to an end.The lack of grazing in this region gives rise to ever growth of grasses,the tall grass falls on the ground and prevents further growth of vegetation.