What has the increase in human population resulted in?

Directions: Read the passage given below carefully and answer the question that follows.

The Indian Elephant is the largest and the heaviest of all terrestrial mammals. It is found in Assam, Arunachal Pradesh, Meghalaya, Tripura, West Bengal, Bihar, Kerala and similar states. Elephants move in herds forming a single file. A herd ranging from five to eleven elephants or at times even up to seventeen forms a family. They are usually three and a half meters high at the shoulder. They feed generally on all species of bamboo and several species of grasses. The animal cannot tolerate high temperature and its average life span is around seventy years. Its population is rapidly declining because it is hunted out for tusk which has commercial value. Their habitat loss is attributed to the increasing human population and its need for fuel wood and timber, which has had a severe impact on the wild elephant population. The demand for elephant ivory for making tourist items is higher than ever before, which is a major reason for their decline in population.