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IB DP ESS — Topic 7: Natural Resources | SL & HL | Paper 1 & Paper 2A/2B
🎯 Learning Intentions By the end of this note, you will be able to:
- Define waste, solid waste, hazardous waste, and e-waste using IB-aligned ESS terminology.
- Classify waste into categories (municipal solid waste, industrial waste, hazardous waste, organic waste, e-waste) and distinguish between biodegradable and non-biodegradable waste.
- Explain the environmental and human health impacts of different waste types, including leachate formation, greenhouse gas emissions from landfill, and bioaccumulation of toxic substances.
- Describe the waste hierarchy (reduce, reuse, recycle, recover, dispose) and evaluate its application in different national and socioeconomic contexts.
- Analyse waste management strategies — landfill, incineration, composting, recycling, and anaerobic digestion — using ESS analysis parameters including scale, sustainability, trade-offs, and multiple perspectives.
- Evaluate the effectiveness of national and international approaches to waste reduction, including extended producer responsibility (EPR), the Basel Convention, and circular economy frameworks.
- Discuss contrasting worldviews (ecocentric, technocentric, anthropocentric) in relation to waste generation and management strategies.
Real-World Context & Relevance
In 2018, the Chinese government implemented its National Sword policy, abruptly banning the import of 24 categories of solid waste and setting strict contamination limits on recyclable materials. Almost overnight, recycling systems across North America, Europe, and Australia collapsed. Cities that had proudly promoted kerbside recycling found themselves with nowhere to send their collected plastics and paper — materials that had previously been shipped to China for processing. Recyclable waste began piling up in warehouses, and some municipalities quietly resumed sending sorted materials to landfill. The crisis exposed a fundamental truth: the global waste management system had been built on a hidden subsidy — cheap labour and lax environmental standards in the Global South absorbing the waste of wealthy nations.
The scale of the problem is staggering. The World Bank estimates that the world generated approximately 2.01 billion tonnes of municipal solid waste in 2016, a figure projected to rise to 3.40 billion tonnes by 2050 as urbanisation and consumption increase, particularly in low- and middle-income countries (Silpa Kaza et al., "What a Waste 2.0"). At the same time, the informal waste sector — millions of waste pickers in cities like Cairo, Mumbai, and Lagos — processes a significant fraction of urban waste outside any formal regulatory framework, often at great personal health cost. Understanding waste not as an isolated disposal problem but as a symptom of linear resource flows within human–environment systems is the starting point for meaningful analysis.
🌍 Why This Matters Waste generation is both a consequence of unsustainable resource consumption and a driver of environmental degradation — contaminating soils, waterways, and the atmosphere, while disproportionately affecting the health of low-income communities and ecosystems adjacent to disposal sites. Transitioning from a linear "take–make–dispose" model to a circular economy is one of the central sustainability challenges of the 21st century.
Core Concepts & Definitions
Before we can manage waste effectively, we need to understand what it actually is — and that definition is less straightforward than it first appears. In everyday language, waste is simply "stuff we throw away," but from a systems perspective, waste represents matter and energy that has left the productive loop of a human economic system. Whether that matter becomes a pollutant or a resource depends almost entirely on what happens next.
📖 Key Definition — Waste Waste is any material or substance that is discarded, or intended to be discarded, by its