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Thermal Pollution

Humans can have the greatest effect on water temperature by contributing to thermal pollution.

Thermal pollution can result from warm water being discharged from an electric power generating station or rain water draining off heated streets, sidewalks, and parking lots.  Sewage and other waste water discharge may or may not be hazardous, but it can change the temperature of surface water.  Large quantities of heated waste water can markedly change the temperature in a river or stream.

More streets and parking lots = more thermal pollution
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