Thermal Pollution ► What is it? Power plants and industries use water from lakes or rivers as a coolant but return it to the environment at a higher than normal temperature
TP ► What causes it? Cold water is taken from great depths and returned warmer
TP ► Why is it bad? Species suffocate in the presence of warmer water – Warm water does not hold as much oxygen as cold water Some organisms move away Contributes to algal and bacterial growth
TP ► What can be done about it? Find other uses for heated water
Erosion ► What is it? The process by which earth’s surface is worn away by: – Water – Glaciers – Wind – Waves – Humans
E ► What causes it? Deforestation Overgrazing Poor land management
E ► Why is it bad? Nutrient-rich soil is washed away Sediments contaminate water supplies Desertification
E ► What can be done about it? Planting trees Cover crops Wind breaks Terrace farming Runoff barriers Rotate pastures