Thermal pollution?

Thermal pollution?

• A. Natural temperature fluctuations
• B. Oil spills
• C. Chemical runoff
• D. Discharge of warm water lowers oxygen levels and harms aquatic life

Answer: (D)

Thermal pollution hinges on heat added to water bodies and how that heat changes oxygen availability for aquatic life. When warm water is discharged into rivers, lakes, or oceans, the water’s solubility for oxygen drops—the warmer the water, the less oxygen it can hold. That reduced oxygen can stress or suffocate fish and other aerobic organisms, disrupt feeding and reproduction, and shift the ecosystem balance. Warm water can also boost metabolism and oxygen demand of organisms, compounding stress and leading to poorer survival and altered communities. The idea that discharging warm water lowers oxygen levels and harms aquatic life captures the essential mechanism and its ecological impact. Natural temperature fluctuations aren’t pollution, and oil spills or chemical runoff involve introducing pollutants other than heat, so they don’t describe thermal pollution.

Thermal pollution hinges on heat added to water bodies and how that heat changes oxygen availability for aquatic life. When warm water is discharged into rivers, lakes, or oceans, the water’s solubility for oxygen drops—the warmer the water, the less oxygen it can hold. That reduced oxygen can stress or suffocate fish and other aerobic organisms, disrupt feeding and reproduction, and shift the ecosystem balance. Warm water can also boost metabolism and oxygen demand of organisms, compounding stress and leading to poorer survival and altered communities. The idea that discharging warm water lowers oxygen levels and harms aquatic life captures the essential mechanism and its ecological impact.

Natural temperature fluctuations aren’t pollution, and oil spills or chemical runoff involve introducing pollutants other than heat, so they don’t describe thermal pollution.