S ince cold water can hold more dissolved oxygen than warm water, one of the man-made problems associated with water quality is thermal pollution.
Thermal pollution is the introduction of warm water or other substrates into an aquatic ecosystem.
Sources include industries such as power plants and also storm-drain runoff which has been warmed on streets, parking lots and sidewalks. I n addition, human activities such as cutting down trees, the removal of vegetation around the water, and construction can lead to an increase in water temperature. These practices can cause an increase in erosion which leads to an increase in dissolved solids in the water. As dissolved solids increase, the water becomes turbid or cloudy which allows the absorption of the sun's rays which increases the water temperature. I ncreases in temperature also cause changes in aquatic plants and animals.