i want an essay on environmental pollutiom ( in 400 ) words

The following may be used in an essay on environmental pollution:

i) Defining pollution as presence of unwanted and unhealthy substances in natural environment including air, water and land.

ii) Types of pollution- Air, water, noise, light.

ii) Causes of pollution- Smoke and effluent discharge from industries, exhaust from automobiles, use of pesticides and insecticides and their seepage into ecosystem through water and land, noise pollution- particularly in urban areas. Effects of pollution in the form of smog and acid rain, poor health and loss of productivity.

iv) Remedial action- Laws to prevent pollution, adoption of cleaner technology, awareness among citizens, effort to keep surroundings clean.