Waste management: Rapid growth in the human population and an increase in the standard of living mean that increasingly more resources are used and more waste is produced. Unless waste and chemical materials are properly handled, more pollution will be caused.

The idea

Human numbers are rising quickly, and on average each person expects a higher standard of living, with more food, goods, energy and travel. Both trends multiply demand for finite resources such as metal ores, fossil fuels and fresh water. Extracting, processing and using these resources generates waste: domestic rubbish, sewage, industrial scrap, waste gases and surplus chemicals. If waste is tipped, burned or discharged without proper handling, it escapes into air, water and land, causing pollution that harms organisms and ecosystems. For example, untreated sewage released into a river raises nutrient levels, microbes decompose it and dissolve oxygen falls, so fish suffocate. Proper handling means treating sewage, recycling materials, containing and neutralising chemical waste, and using landfill or incineration with controls.

What earns the marks

• Links rapid human population growth to increased demand for resources such as food, water, metals and fossil fuels.
• Links a rising standard of living to greater per-person consumption of goods, energy and travel, so demand rises further.
• Explains that extracting, processing and using resources produces waste, including domestic, agricultural, industrial and chemical waste.
• States that waste and chemical materials must be properly handled, for example treated, recycled, contained or safely disposed of.
• Explains that improper handling lets waste escape into air, water or land, causing pollution that damages organisms and ecosystems.
• Uses a named example, such as untreated sewage lowering dissolved oxygen in a river, to show the pollution consequence.

Common mistakes and how to put them right

• Saying population growth alone causes pollution.

  Put it right: Also credit rising living standards, because each person consumes and wastes more.

• Treating all waste as harmless once buried.

  Put it right: Chemical waste can leach into groundwater, so containment and treatment are needed.

• Confusing waste production with pollution.

  Put it right: Waste becomes pollution only when it is released into the environment without proper handling.

Exam tips

• Use the command word: if asked to explain, give a causal chain such as more people → more resources used → more waste → pollution if mishandled.
• Include one specific example of a resource and one specific waste or pollutant to make the link concrete.
• When asked to suggest a method, name the handling step, such as sewage treatment or recycling, and state how it reduces pollution.