Human Impact on Pollution and Biodiversity Revision Notes | GCSE OCR Foundation Biology

What this lesson covers

Investigate how rapid population growth and increased living standards lead to greater resource use and waste production, and examine how pollution affe...

• Explain how human population growth and increased living standards lead to greater resource use and waste production
• Describe the different types of pollution caused by human activities and their sources
• Analyse how pollution reduces biodiversity by killing plants and animals
• Evaluate methods to reduce human impact on ecosystems and biodiversity

Key ideas to keep in view

Use this lesson to stay inside B6.1 Monitoring and maintaining the environment while connecting the detail back to the wider B6: Global challenges topic.

• B6: Global challenges
• B6.1 Monitoring and maintaining the environment
• GCSE OCR Foundation Biology

Lesson notes preview

Read the core explanations from Human Impact on Pollution and Biodiversity before testing yourself from memory.

• Picture this: in 1800, there were about 1 billion people on Earth. Today? Over 8 billion. That's not just more mouths to feed — it's more cars, more factories, more plastic bottles, and more waste than our planet has ever seen.
• But here's the real kicker: it's not just about numbers. As countries develop, people want better lives — bigger houses, more gadgets, meat instead of vegetables. This means each person uses far more resources than their great-grandparents ever did.
• The level of wealth, comfort and material goods available to a person or community. Higher standards require more resources per person.
• Think about your daily life: smartphone (rare metals), clothes (cotton, synthetic fibres), food (farming, transport), heating (fossil fuels). Multiply that by 8 billion people, and you start to see the scale of the problem.
• All this human activity creates waste. When that waste isn't handled properly, it becomes pollution — and pollution is an ecosystem killer.
• Let's break down the main types of pollution and where they come from:
• Air pollution: Car exhausts pump out carbon monoxide and nitrogen oxides. Power stations burning coal release sulfur dioxide. Factories add their own cocktail of toxic gases. All of this creates smog that chokes both humans and wildlife.
• Water pollution: Sewage from cities, fertilisers from farms, and chemicals from factories all end up in rivers and oceans. Oil spills coat seabirds. Plastic waste forms massive floating islands in the Pacific.
• Land pollution: Pesticides soak into soil. Landfill sites leak toxic chemicals into groundwater. Heavy metals from mining contaminate vast areas.
• Here's where it gets serious for ecosystems. Pollution doesn't just make the environment 'a bit dirty' — it actively kills plants and animals, which crashes biodiversity.

Continue through the topic

Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.