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IB DP ESS — Topic 5: Land (HL Extension) | HL | Paper 1 & Paper 2
🎯 Learning Intentions By the end of this note, you will be able to:
- Define industrial agriculture, organic farming, agroforestry, permaculture, and urban agriculture using IB-aligned ESS terminology.
- Compare and contrast industrial (high-input) and alternative (low-input) farming systems in terms of energy use, biodiversity, soil health, and ecosystem services.
- Explain how different farming approaches interact with soil systems, water cycles, and biodiversity at local and regional scales.
- Analyse the environmental, economic, and social trade-offs of contrasting agricultural choices using ESS analysis parameters: Scale, Sustainability, Trade-offs, and Multiple Perspectives.
- Evaluate the effectiveness of alternative farming systems in addressing food security, soil degradation, and biodiversity loss.
- Discuss contrasting worldviews — ecocentric, technocentric, and anthropocentric — in relation to agricultural decision-making and land management.
- Justify the role of agroecological approaches in transitioning toward more sustainable food systems at local and global scales.
Real-World Context & Relevance
In 2019, the IPBES Global Assessment reported that agricultural expansion is the primary driver of biodiversity loss worldwide, directly threatening approximately one million plant and animal species with extinction (IPBES, "Global Assessment Report on Biodiversity and Ecosystem Services," 2019). Agriculture currently occupies roughly 50% of the world's habitable land surface, consumes approximately 70% of global freshwater withdrawals, and contributes between 19–29% of total greenhouse gas emissions when land-use change is included (FAO, "The State of Food and Agriculture," 2021). These figures reveal a profound tension at the heart of modern food systems: the same agricultural practices that feed over eight billion people are simultaneously undermining the ecological foundations upon which all food production depends.
Yet the story is not uniform. In the Loess Plateau of China, a large-scale restoration project combining agroforestry, terracing, and reduced grazing transformed 35,000 km² of severely degraded land into productive, biodiverse landscape within two decades — demonstrating that alternative land management can reverse ecological damage at scale (World Bank, "Restoring China's Loess Plateau," 2007). Meanwhile, in the United Kingdom, the Knepp Estate in West Sussex shifted from conventional arable farming to a rewilding-adjacent approach and documented the return of turtle doves, purple emperor butterflies, and peregrine falcons within fifteen years (Tree, Isabella. Wilding . Picador, 2018). These contrasting examples — industrial degradation versus agroecological recovery — frame the central question of this topic: what choices do farmers, governments, and societies make about how land is used, and what are the environmental consequences of those choices?
🌍 Why This Matters Agricultural choices are not merely technical decisions — they are environmental, ethical, and political ones. How societies choose to produce food determines the fate of soil carbon stocks, freshwater systems, pollinator populations, and rural livelihoods. Understanding the trade-offs between industrial and alternative farming systems is essential for evaluating pathways toward genuine food system sustainability.
Core Concepts & Definitions
To understand why agricultural choices matter so profoundly for environmental systems, it is necessary to first understand what distinguishes different farming approaches at a systems level. The fundamental contrast is between high-input systems, which substitute ecological processes with external energy and chemical inputs, and low-input or