IB Geography G.4.3 Eco-city Design Notes

Eco-City Design: Lower Resource Use and Waste Reduce the Urban Ecological Footprint

1. An eco-city is planned and managed to meet human needs while reducing resource use, waste, pollution and ecological damage.
2. An ecological footprint estimates the biologically productive land and water needed to supply consumption and absorb wastes.
3. A city's footprint extends beyond its boundary because food, energy, water and materials often come from distant regions.
4. Dense settlement can reduce travel and infrastructure per person, but density alone does not guarantee low consumption.
5. Eco-city design changes buildings, transport, water, waste, food and green space as one urban system.
6. Demand reduction comes before cleaner supply because an efficient system can still have a large footprint if total consumption keeps rising.

Energy and Buildings: Passive Design Cuts Demand Before Renewables Supply It

1. Passive design uses orientation, insulation, shading, thermal mass and ventilation to reduce heating and cooling demand.
2. Compact buildings share walls and can reduce heat loss compared with detached housing.
3. Retrofitting insulation and windows can save more embodied carbon than demolishing and rebuilding a sound structure.
4. District heating distributes heat from a central source to many buildings through insulated pipes.
5. Combined heat and power can use fuel more efficiently by capturing heat that electricity generation would waste.
6. Heat pumps and low-temperature networks can reduce fossil-fuel use when electricity is increasingly renewable.
7. Rooftop solar generates electricity close to users but varies with roof area, orientation and weather.
8. Storage, demand management and connection to a wider grid help balance variable renewable output.
9. Building standards work best when they cover both new construction and the much larger stock of existing buildings.
10. Upfront costs can exclude lower-income households unless grants, standards or social housing programmes spread the benefits.

Transport and Land Use: Shorter Trips Make Low-Carbon Travel Practical

1. Mixed land use places homes, jobs, shops and services close enough for shorter trips.
2. Transit-oriented development concentrates growth around frequent public transport instead of highway junctions.
3. Bus rapid transit uses dedicated lanes, rapid boarding and coordinated routes to move more people without rail costs.
4. Trams and metro systems have high capacity but need large investment and enough passengers to justify it.
5. Continuous footpaths, safe crossings, protected cycle routes and secure parking make active travel realistic.
6. Car-reduced streets can improve air quality, safety and public space, but restrictions need accessible alternatives.
7. Electric vehicles reduce tailpipe emissions but still use road space, energy and materials.
8. Parking policy affects behaviour because cheap abundant parking encourages driving even where transit exists.
9. Affordable fares and routes serving peripheral districts determine whether low-carbon transport also improves social inclusion.

Water, Waste and Food: Circular Flows Replace the Take-Use-Discard Pattern

1. Rainwater capture stores roof runoff for irrigation, cleaning or toilet flushing where regulations allow.
2. Greywater reuse treats water from showers and sinks for non-drinking uses.
3. Leak detection and efficient fixtures cut demand before new supply is built.
4. Permeable surfaces and wetlands reduce runoff while supporting groundwater recharge and habitat.
5. Waste separation at source keeps paper, metals, glass, organics and hazardous materials in cleaner streams.
6. Composting returns nutrients and organic matter to soils, while anaerobic digestion can also produce biogas.
7. Repair, reuse and remanufacture preserve more of a product's embedded energy than recycling it into raw material.
8. Materials recovery facilities sort mixed recyclables, but contamination lowers both value and recovery rates.
9. Urban agriculture can shorten some food chains, create green space and use compost or captured water.
10. It cannot supply every food need of a dense city, so regional farming and trade remain important.
11. Food waste prevention usually saves more land and energy than treating the waste after it is discarded.

Green Infrastructure: One Space Can Cool, Store Water and Support Biodiversity

1. Green infrastructure is a connected network of vegetation, soils and water features that provides urban ecosystem services.
2. Street trees provide shade and evapotranspiration, which can lower local heat exposure.
3. Green roofs retain rainfall, insulate buildings and add habitat where ground space is limited.
4. Constructed wetlands store and clean water while creating habitat and recreation space.
5. Parks on flood-prone land can accept temporary inundation with less damage than housing or industry.
6. Connected habitats allow species to move between larger green areas.
7. Benefits depend on species choice, soil volume, irrigation and long-term maintenance.
8. Greening can raise nearby property values and rents, so protection against displacement may be needed.
9. Canopy maps should be compared with income and heat-risk maps to test whether benefits are distributed fairly.

Freiburg: Vauban Combines Low-Energy Housing with Car-Reduced Urban Form

1. Place context: Freiburg is a high-income German city with strong municipal planning capacity and a long environmental policy tradition.
2. Vauban was developed on a former military site near the existing city rather than as an isolated new settlement.
3. The district now houses about 5,500 people on roughly 41 hectares.
4. Low-energy construction is compulsory, while passive houses, plus-energy buildings and solar technology are common.
5. Orientation, insulation and solar design reduce energy demand before renewable electricity is added.
6. A tram connection has served the district since 2006 and links residents to the wider city.
7. Traffic-calmed streets and parking at district-edge garages reduce through traffic and free space for walking, cycling and play.
8. Green roofs retain part of the rainfall, and mature trees and green strips support cooling and recreation.
9. Schools, childcare, shops and community facilities were developed alongside housing, reducing the need for longer trips.
10. Citizen groups and cooperative building shaped the district, so social organization supported the physical design.
11. High land and housing costs can limit who can access the environmental benefits.

Curitiba: BRT, Floodable Parks and Exchange Schemes Use Limited Capital Strategically

1. Place context: Curitiba is a Brazilian city whose rapid growth required lower-cost ways to coordinate transport, land use and environmental management.
2. Bus rapid transit uses dedicated corridors, high-capacity buses and tube stations with pre-paid boarding.
3. The system provides metro-like operating features at lower construction cost than an underground railway.
4. Development was directed along structural transport corridors so density supports ridership.
5. The system's environmental gain depends on service quality, clean vehicles and enough capacity to keep passengers from switching to cars.
6. Floodplain parks store floodwater on land where building would create greater exposure.
7. Using sheep to graze some parkland has reduced mowing needs and linked maintenance to land management.
8. The parks provide recreation and habitat while avoiding some costly concrete channel works.
9. Green Exchange has allowed residents in hard-to-reach settlements to exchange sorted waste for food or transport tokens.
10. The scheme connects cleaner neighbourhoods with food access and participation in the waste system.
11. Curitiba's strategy shows that institutional coordination and simple incentives can matter as much as expensive technology.
12. Outer growth, rising car ownership and uneven service quality still test the original model.

Eco-City Performance Needs Measures That Cover Consumption and Distribution

1. Territorial emissions count greenhouse gases released inside the city boundary.
2. Consumption-based emissions add emissions embodied in imported goods and services and subtract those embodied in exports.
3. A service city can report low territorial emissions while consuming materials produced in carbon-intensive regions.
4. Energy intensity measures energy use against population, floor area or economic output.
5. A falling intensity can coexist with rising total energy use if population and incomes grow faster.
6. Modal split shows the share of journeys made by walking, cycling, public transport and private vehicles.
7. Journey distance and vehicle occupancy are also needed because two cities with the same modal share may use different amounts of energy.
8. Water loss can be measured as the share of treated water that does not reach a billed user.
9. Per-person consumption should be separated from industrial use and checked against local water scarcity.
10. Waste diversion records material kept from landfill or incineration through reuse, composting and recycling.
11. A high diversion rate can hide rising waste generation, so kilograms of waste per person should also be reported.
12. Green-space access measures whether residents can reach usable green space rather than counting only total hectares.
13. Canopy cover, biodiversity and cooling performance add quality to the access measure.
14. Housing affordability tests whether environmental improvement remains accessible to different income groups.
15. If low-income residents are displaced, the city may improve a district while exporting its social cost.
16. Life-cycle assessment includes construction, maintenance and disposal rather than counting only operational energy.
17. A baseline and time series show whether a policy changed performance instead of describing one attractive project.
18. Comparison with a similar district can help separate policy effects from wider economic or demographic change.

Policy Tools Turn Eco-City Goals into Everyday Decisions

1. Regulation sets minimum building, vehicle, waste or water standards that apply across the city.
2. Standards create a common floor but need inspection and enforcement.
3. Pricing can charge for congestion, waste, water or carbon so users face more of the environmental cost.
4. A flat charge can burden low-income households, so lifeline tariffs or targeted rebates may be needed.
5. Subsidies can lower the upfront cost of insulation, solar panels, efficient appliances or public transport.
6. Poorly targeted subsidies may reward households that would have invested without public money.
7. Public provision allows the city to build transit, parks, social housing and utility networks where private returns are low.
8. Public agencies still need stable revenue and accountable procurement.
9. Information can support behaviour change through building labels, travel data and clear waste instructions.
10. Information has limited effect when residents lack affordable alternatives.
11. Land-use planning reserves space and coordinates housing density with transport, drainage and green infrastructure.
12. Long-term plans need protection from piecemeal exemptions that weaken the network.
13. Community ownership can keep benefits and decision-making closer to residents through cooperatives or local energy schemes.
14. A policy mix is stronger than one instrument because regulation, finance, infrastructure and behaviour interact.

Freiburg and Curitiba Reach Lower Footprints Through Different Resource Paths

1. Freiburg uses greater capital and strict building standards, while Curitiba relied heavily on lower-cost transport and land-use coordination.
2. Vauban begins with building energy and car reduction, while Curitiba's strongest gains come from BRT, floodable parks and waste participation.
3. Both examples integrate systems instead of treating energy, transport and green space as separate projects.
4. Both show that long-term municipal planning can shape daily behaviour through urban form.
5. Neither example removes imported food, materials and energy from the city's ecological footprint.
6. Transfer depends on income, climate, governance, existing urban form and whether residents can afford the new district or service.
7. The strongest evaluation compares measurable outcomes, distribution of benefits and the resources needed to maintain them.