For SL and HL, Subtopic 7.3 Solid waste: waste volume and composition vary because societies differ in income, consumption, policy, environmental conditions, and technology. Wealthier societies generally generate more waste per person and more packaging, plastics, and electronic waste; lower-income societies often produce a higher proportion of organic waste.
Why Waste Patterns Vary
Waste volume is the total quantity generated, whereas waste composition is the proportion of food, paper, plastic, metal, glass, textiles, and electronic waste. Patterns change with economic development, urbanization, demographic shifts, and technological innovation.
| Factor | Effect on waste patterns |
|---|---|
| Socio-economic conditions | Higher incomes usually increase consumption and disposable packaging. Lower-income households often reuse goods and generate proportionally more biodegradable waste. |
| Political decisions | Landfill taxes, recycling laws, deposit-return schemes, and plastic restrictions can reduce residual waste and increase separation. |
| Environmental conditions | Climate affects food storage and decomposition; land availability influences landfill, incineration, or recycling. |
| Technology | Online shopping can increase cardboard and packaging waste. Device replacement increases electronic waste, while composting and recycling divert materials. |
| Culture and demographics | Diet, household size, festivals, repair habits, and acceptance of second-hand goods affect volume and composition. |
Japan's limited land and detailed household sorting encourage recycling and incineration rather than extensive landfill. Rwanda's restrictions on plastic carrier bags show how legislation can change waste composition.
A common misconception is that economic development always improves waste management. Better infrastructure may increase collection and recycling, but rising consumption can still increase total waste. Waste exports create environmental justice concerns when affluent consumers' pollution is transferred to lower-income communities.
Exam Technique
For an explain question, identify one factor, show the causal link to volume or composition, and add a named example. Distinguish total waste volume from percentage composition; they are not the same measurement.
