Water pollution management
Big idea: Managing water pollution requires a combination of prevention (stopping pollution at source), treatment (cleaning contaminated water), and restoration (repairing damaged ecosystems). Prevention is usually the most effective and lowest-cost approach.
Strategies to reduce nutrient pollution
- Riparian buffer zones
- Precision agriculture — applying fertilizers only where needed
- Cover crops — reducing erosion and absorbing excess nutrients
- Phosphate-free detergents — lowering household phosphorus inputs
- Improved wastewater treatment — removing nitrogen and phosphorus
- Constructed wetlands — using natural processes to filter water
Policy and economic approaches
- Legislation — setting legal pollution limits
- Polluter pays principle — polluters cover the cost of damage
- Subsidies — incentives for sustainable practices
- Fines and penalties — discouraging illegal pollution
- Public education — encouraging responsible behaviour
Strong answers explain HOW each strategy reduces pollution, rather than listing strategies without explanation.