Thermal pollution is categorized as the discharge of heated water from industrial processes in receiving surface water, causing death or injury of aquatic organisms. This process is considered harmful due to the discharging of waste products into localized areas. One instance of thermal pollution is when power plants utilize water that is brought in for the purposes of cooling, and accidentally sends the water into the surrounding rivers which damages the ecosystem. There are various detrimental impacts seen by thermal pollution and takes effect in harming the organisms inhabiting the area. There are differences in the response of bacteria, alge, animals, and plant species that depend mainly on changes in the temperature.