Welcome to Planning for Sustainable Settlements
Welcome to your study notes for A2 2: Processes and Issues in Human Geography (Option B: Planning for Sustainable Settlements). Cities across the globe face massive challenges: overcrowding, pollution, gridlocked traffic, and mounting piles of waste. But how do we design towns and cities that are great to live in today without destroying the planet for tomorrow?
In this chapter, you will learn the core principles of sustainability, investigate how modern urban planners design smart cities, and evaluate real-world transport and waste solutions using classic case studies like Curitiba, Brazil. Let's break it down step-by-step!
1. Understanding Sustainable Development
What is Sustainability?
The standard definition used by geographers comes from the Brundtland Report (1987). It defines sustainable development as:
"Development that meets the needs of the present without compromising the ability of future generations to meet their own needs."
The Three Pillars of Sustainability
To be genuinely sustainable, an urban project must satisfy three core dimensions at the same time. You can remember these using the simple memory trick S.E.E.:
• Social Sustainability: Creating fair, safe, and inclusive communities where everyone has access to housing, healthcare, clean water, and recreation.
• Economic Sustainability: Supporting reliable jobs, business growth, and affordable infrastructure without plunging the city into debt.
• Environmental Sustainability: Protecting ecosystems, cutting greenhouse gas emissions, reducing resource consumption, and minimising pollution.
Common Exam Mistake to Avoid: Many students describe sustainability as simply "being green" or planting trees. In your A2 exam, you will lose marks if you ignore the Social and Economic pillars!
Two Vital Ecological Concepts
Urban planners must balance two key geographical measurements:
1. Carrying Capacity: The maximum population size and level of human activity that an environment can sustain indefinitely without long-term degradation or collapse.
2. Ecological Footprint: The total area of biologically productive land and water required to provide all the resources a population consumes and to safely absorb all the waste it creates.
Everyday Analogy: Think of carrying capacity as the weight limit on an elevator. If too many people pile in, the system breaks. Your ecological footprint is the amount of floor space each person takes up. A sustainable city keeps its total footprint well within its environmental limits.
The UN Sustainable Development Goals (SDGs)
Adopted by the United Nations, the SDGs are a set of 17 global goals intended to be achieved by the year 2030. For this geography unit, the most critical target is Goal 11: Sustainable Cities and Communities, which focuses on making human settlements inclusive, safe, resilient, and environmentally sound.
Section Key Takeaway: True sustainability is a three-way balance (Social, Economic, Environmental) that keeps human resource consumption within Earth's carrying capacity.
2. Urban Planning and Sustainable Design
The Rogers Model of a Sustainable City
Architect and urbanist Richard Rogers designed a theoretical framework comparing an unsustainable city with a sustainable one:
• Traditional Unsustainable City (Linear Model): Operates on a "take-make-waste" system. Huge amounts of energy, food, and raw materials are brought in, consumed, and dumped out as massive waste and pollution into the surroundings.
• Rogers Sustainable City (Circular/Compact Model): Designed as a compact, polycentric (multi-centred) urban space. It prioritises high density over sprawl, maximises social inclusion, relies on clean public transport, and loops resources back into the system through recycling and energy recovery.
Key Urban Design Strategies
To build a Rogers-style compact city, planners use several specific spatial strategies:
• Brownfield vs. Greenfield Development:
- Brownfield sites: Abandoned, derelict, or previously industrial land within existing urban boundaries. Reusing brownfield sites cleans up eyesores, utilises existing roads/pipes, and stops cities from invading the countryside.
- Greenfield sites: Untouched rural or agricultural land on the edge of the city. While cheaper to build on initially, building here promotes destructive urban sprawl (uncontrolled horizontal spreading of a city) and increases car dependency.
• Mixed-Use Development: Designing neighbourhoods that integrate residential housing, offices, retail shops, and leisure facilities in close proximity. This drastically cuts commuting distances, encouraging walking and cycling.
• Waste Management & The Circular Economy: Moving away from open landfill dumps toward resource recovery. Cities achieve this by enforcing citywide recycling schemes and establishing Energy-from-Waste plants (incinerating non-recyclable rubbish under controlled conditions to generate electricity and heat).
Global Sustainable City Case Study: Curitiba, Brazil
Curitiba is world-renowned as a model for low-cost, highly effective sustainable urban planning.
• The "Green Exchange" Program (Cambio Verde): In low-income favelas where rubbish collection trucks cannot access narrow streets, the city set up an exchange scheme. Residents bring separated recyclables to collection centres and receive fresh seasonal fruit, vegetables, or bus tokens in return (1 kg of food for every 4 kg of recyclable waste).
• Evaluation of Cambio Verde:
- Social benefit: Improves nutrition and public health for poorer citizens.
- Environmental benefit: Cleans up rubbish from waterways and valleys; over 70% of Curitiba's waste is recycled.
- Economic benefit: Saves money on street cleaning and healthcare while supporting local farmers who supply the surplus food.
Section Key Takeaway: Sustainable urban planning replaces linear waste streams with circular resource systems and curtails urban sprawl by regenerating brownfield land.
3. Sustainable Traffic and Transport Management
Why is Urban Traffic Management Crucial?
Excessive private car use leads to gridlock, economic losses from delayed freight, severe local air pollution (smog), and high carbon emissions. Sustainable settlements aim to reduce the need to travel and make public transport the most attractive choice.
Key Transport Strategies
• Integrated Transport Systems: Seamlessly connecting different travel modes (buses, metro rail, commuter trains, bike-share schemes) under a single ticketing system and timetable, making transfers fast and effortless.
• Congestion Charging: Imposing a direct financial fee on private vehicles entering designated high-density city centres during peak hours (e.g., London's Congestion Charge). This discourages unnecessary car trips and raises revenue to fund public transit.
• Pedestrianisation: Removing motor vehicles entirely from central retail and cultural streets, creating clean, quiet, and safe environments that boost footfall for local shops.
• Public Transport Priority: Creating dedicated Bus Rapid Transit (BRT) lanes, bus-activated traffic lights, and segregated cycle superhighways so public and active transport bypass traffic queues.
Transport Case Study: Curitiba's Bus Rapid Transit (BRT)
Rather than building an unaffordable underground subway system, Curitiba pioneered an above-ground Bus Rapid Transit (BRT) network that moves passengers with subway-like speed at a fraction of the cost.
• Key Features of Curitiba's BRT:
- Dedicated Express Bus Lanes: Central avenues have exclusive lanes physically separated from regular traffic, preventing buses from getting stuck in congestion.
- Triple-Articulated Buses: Extra-long, bi-articulated red buses carrying up to 270 passengers at once.
- Raised Glass "Boarding Tubes": Passengers pay their fare before entering the tube station at street level. When the bus arrives, doors open directly onto elevated platforms, enabling rapid, step-free boarding in seconds.
• Success Metrics & Evaluation:
- Around 75% of Curitiba's commuters use public transport daily.
- The city enjoys significantly lower per-capita air pollution and fuel consumption compared to other Brazilian cities of similar size.
- It proves that developing nations can create world-class sustainable transport without multi-billion-pound rail infrastructure.
Section Key Takeaway: Sustainable transport relies on integrated networks, dedicated bus corridors, and economic disincentives for private car use.
4. Exam Skills & Quick Revision Checklist
Pitfalls to Avoid in the A2 Exam
• Don't just describe; EVALUATE: Higher-level exam questions will ask you to "evaluate", "assess", or "discuss" sustainable strategies. Always state the strengths, point out any limitations (e.g., initial costs, enforcement issues, public opposition), and arrive at a reasoned conclusion.
• Don't mix up the problem and the solution: Urban sprawl is the uncontrolled, car-dependent expansion of a city (the problem). Compact cities and smart growth are the planning policies designed to fix it (the solution).
• Be case-study specific: Use real facts from your studied city, such as Curitiba's 70% recycling rate, Cambio Verde (1kg food for 4kg recyclables), and 75% public transit ridership.
Quick Review Summary Box
• Brundtland Definition (1987): Meeting present needs without compromising future generations.
• Three Pillars (S.E.E.): Social, Economic, Environmental.
• Carrying Capacity vs. Ecological Footprint: Environmental limit vs. human demand.
• UN SDG 11: Sustainable Cities and Communities by 2030.
• Rogers Model: Compact, polycentric, circular resource flow vs. linear "take-make-waste".
• Land Choice: Prioritise brownfield over greenfield to curb sprawl.
• Curitiba Solutions: Green Exchange (Cambio Verde) + BRT system with boarding tubes and triple-articulated buses.