Agriculture

• Using fertilisers increase a crops yield but can cause eutrophication.
• Pesticides and insecticides increase crop yield as it kills pests so minimises the damage but they can become resistant and harm other animals, is expensive and timely.
• Biological control increases yield but can cause extinction or over population and harm food chains and ecosystems.
• Bt toxin was introduced into crop to kill insect larvae and deter pests from destroying the crop.