IGCSE Biology / Human influences on the environment

Sewage, carbon monoxide and sulfur dioxide

Edexcel International GCSE Biology (4BI1), chapter 15: Human influences on the environment, specification point 4.12, 4.16. Part of the full course.

Read the revision notes · IGCSE Biology past papers

Sewage and air pollutants harm living things in different ways. Knowing each pollutant’s source, effect and method of reduction helps you explain how pollution can be controlled.

More lessons in Human influences on the environment

• Glasshouses and polythene tunnels, and why they raise yield
• How fertilisers increase crop yield
• Pesticides and biological control
• Feeding people without emptying the sea
• Greenhouse gases and global warming
• How acid rain forms and what it does
• The effects of cutting down forests
• Fertiliser, algae and dead water
• Sustainable resources and conservation