Environmental pollution results from ‘the release of substances and energy from waste products of human activities. There are many types of pollution. They are classified on the basis of the medium through which pollutants are transported and diffused. Pollution can be classified into (i) air pollution, (ii) water pollution, (iii) land pollution and (iv) noise pollution.

What has NOT led to the degradation of the quality of water considerably?

Increase in forest cover.

Indiscriminate use of water by increasing population and industrial expansion has led degradation of the quality of water considerably.