Consider the following:
1. Thermal power plants
2. Sewage treatment plants
3. Solid waste disposal sites
Which among the above cause thermal pollution of water bodies?

Answer: [A] Only 1

Thermal pollution is the degradation of water quality by any process that changes ambient water temperature. A common cause of thermal pollution is the use of water as a coolant by power plants and industrial manufacturers. When water used as a coolant is re turned to the natural environment at a higher temperature, the change in temperature decreases oxygen supply and affects ecosystem composition. Urban runoff-storm water discharged to surface waters from roads and parking lots-can also be a source of elevated water temperatures.

When a power plant first opens or shuts down for repair or other causes, fish and other organisms adapted to particular temperature range can be killed by the abrupt change in water temperature known as “thermal shock.”

This question is a part of GKToday's Integrated IAS General Studies Module