Environmental Sustainability Case Studies
This lesson examines real-world examples of sustainability in action, from national-level environmental policies to city-scale green initiatives and community-based adaptation strategies. Evaluating case studies critically is essential for achieving high marks in AQA A-Level Geography exam responses.
Case Study 1: Costa Rica — Payments for Ecosystem Services
Background
Costa Rica is widely regarded as a global leader in environmental sustainability. Despite being a small Central American nation (approximately 5.2 million people), it has achieved remarkable environmental outcomes.
Key Achievements
- Forest cover increased from approximately 21% in 1987 to over 52% by 2023 — one of very few countries to reverse large-scale deforestation
- Approximately 98% of electricity is generated from renewable sources (hydroelectric, geothermal, wind, solar)
- Over 25% of national territory is protected in national parks and reserves
- Biodiversity: Costa Rica contains approximately 5% of the world's species despite covering only 0.03% of the Earth's surface
- Carbon neutral target: pledged to reach net zero emissions by 2050 (first country in Latin America)
Payments for Ecosystem Services (PES)
Costa Rica pioneered Payments for Ecosystem Services (PES) through its PSA programme (Pago por Servicios Ambientales), established in 1997.
How It Works:
- Landowners receive direct payments for maintaining forest cover on their land
- Payments are funded by a fuel tax (3.5% of fossil fuel sales), water tariffs, and international carbon credits
- Four ecosystem services are recognised:
- Carbon sequestration and storage
- Hydrological services (watershed protection)
- Biodiversity conservation
- Scenic beauty (for tourism)
- Contracts typically last 5–10 years, with payments per hectare per year
Results:
- Over 1 million hectares enrolled in the programme
- Approximately 18,000 contracts signed since 1997
- Significant contribution to forest recovery
- Created economic incentives for conservation rather than deforestation
- Provided income for rural communities and indigenous peoples
Evaluation
Strengths:
- Demonstrates that economic development and environmental protection can be compatible
- Created a replicable model adopted by other countries (Mexico, Vietnam, Ecuador)
- Integrated conservation into the national economy
- Strong institutional framework and political commitment
Limitations:
- Payments may not be high enough to compete with lucrative land uses (e.g., palm oil, pineapple plantations)
- Additionality debate: some forests enrolled would have been preserved without payments
- Administrative costs are significant
- Does not fully address social inequality — larger landowners benefit more
- Some deforestation has been displaced to neighbouring countries (leakage)
Case Study 2: Masdar City, UAE
Background
Masdar City is a planned sustainable city project in Abu Dhabi, UAE, announced in 2006. It was designed to be the world's first zero-carbon, zero-waste city, powered entirely by renewable energy.
Original Vision
- Zero carbon emissions
- Zero waste (all waste recycled or composted)
- 100% renewable energy (solar)
- Car-free: personal rapid transit (PRT) system and driverless electric vehicles
- Low water consumption: 60% less than a typical city of similar size
- Population: 50,000 residents, 40,000 commuters
- Cost: approximately $22 billion
What Has Been Achieved
- A 10 MW solar photovoltaic plant powers the development
- The Masdar Institute of Science and Technology (now part of Khalifa University) operates on site
- Buildings are energy-efficient: narrow streets channel wind for natural cooling; buildings oriented to minimise solar gain
- Water consumption is approximately 54% lower than Abu Dhabi average
- A community of approximately 1,300 residents and 4,000 workers (as of 2023)
- Headquarters of the International Renewable Energy Agency (IRENA)
Challenges and Revisions
- The zero-carbon target was quietly abandoned: the city is now described as "low carbon"
- The PRT system was scaled back to a small demonstration; most transport relies on electric shuttles and conventional vehicles
- Construction has been much slower than planned; completion date has been extended repeatedly (originally 2016, now uncertain)
- Only a small fraction of the planned area has been built
- Economic viability has been questioned — the 2008 financial crisis reduced investment
- The zero-waste target has not been met
- Critics argue it is an "eco-bubble" for the wealthy rather than a replicable model
Evaluation
Strengths:
- Demonstrates innovative sustainable technologies (building design, solar energy, water conservation)
- Provides a living laboratory for testing green technologies
- Attracted investment in renewable energy research and development
- Raised the profile of sustainability in the Gulf states
Limitations:
- Failed to meet its most ambitious targets (zero carbon, zero waste)
- Extremely expensive and not replicable for most cities
- Small scale: a tiny community rather than a functioning city
- Located in a wealthy petrostate — the contradiction of sustainability funded by oil revenue
- Top-down, techno-centric approach that does not address social dimensions of sustainability
Case Study 3: Freiburg, Germany — A Green City
Background
Freiburg im Breisgau (population approximately 230,000) in south-western Germany is widely regarded as one of Europe's most sustainable cities. Its green reputation dates from the 1970s anti-nuclear movement and has been developed through decades of consistent policy.
Key Achievements
Transport:
- Extensive tram and bus network serving over 70 million passengers per year
- Approximately 30% of journeys are made by bicycle (one of the highest in Germany)
- Car-free residential districts (e.g., Vauban)
- The Vauban district has only 150 car parking spaces per 1,000 residents (compared to a German average of approximately 500)
Energy:
- Over 10,000 solar installations across the city
- The Heliotrop (first revolving solar building, designed by Rolf Disch) produces five times more energy than it consumes
- District heating systems using combined heat and power (CHP) and biomass
- Target: climate neutrality by 2038
Waste:
- Comprehensive recycling programme with separate collection of paper, glass, metals, organic waste, and residual waste
- Over 70% of waste is recycled or composted
- Pay-as-you-throw scheme encourages waste reduction
Green Spaces:
- Over 600 hectares of parks and green spaces within the city
- Urban agriculture and allotment gardens
- Green corridors connecting urban and rural areas, supporting biodiversity
The Vauban District
Vauban is a model sustainable neighbourhood built on a former French military barracks site:
- Approximately 5,500 residents in low-energy and passive houses
- Buildings exceed German insulation standards by up to 30%
- Car-free streets with shared green spaces
- Community-led design process: residents participated in planning decisions
- Solar panels on most buildings; district heating from a wood-chip CHP plant
- Strong sense of community: co-housing projects, community gardens, car-sharing cooperatives
Evaluation
Strengths:
- Demonstrates that sustainability can work at a city scale with strong political will
- Integrated approach: transport, energy, waste, and green space considered together
- Community participation ensures social buy-in
- Replicable model for other medium-sized European cities
- Long-term commitment over decades, not just short-term projects