Environmental Science 101: Sustainability - sustainable Cities Green Buildings Public Transport Urban Planning LEED Certification

What This Is

Sustainable cities are urban areas designed to minimize their environmental impact while promoting economic and social well-being. This concept matters because it helps us understand how human activities affect the environment and how we can mitigate those effects. For example, the rapid urbanization of cities in the developing world has led to increased air pollution, water scarcity, and waste management issues, highlighting the need for sustainable urban planning.

Key Concepts, Laws & Models

• LEED Certification (Leadership in Energy and Environmental Design): A rating system for green buildings that promotes energy efficiency, water conservation, and sustainable materials. Real-world implication: LEED-certified buildings can reduce energy consumption by up to 30% and water usage by up to 50%.
• Compact Urban Form (Urban Planning): A design approach that promotes walkability, bikeability, and mixed-use development to reduce the need for personal vehicles. Real-world implication: Compact urban forms can reduce greenhouse gas emissions by up to 20% and increase physical activity among residents.
• Public Transport (Urban Planning): A transportation system that promotes the use of buses, trains, and other shared modes of transportation to reduce reliance on personal vehicles. Real-world implication: Public transport can reduce greenhouse gas emissions by up to 50% and decrease traffic congestion by up to 30%.
• Green Roofs (Urban Planning): Vegetated roofs that provide insulation, reduce stormwater runoff, and create habitats for urban wildlife. Real-world implication: Green roofs can reduce energy consumption by up to 20% and increase urban biodiversity by up to 50%.
• Urban Heat Island Effect (Climate Science): The phenomenon where urban areas experience higher temperatures than surrounding rural areas due to the urban heat island effect. Real-world implication: Urban heat islands can increase energy consumption by up to 20% and decrease air quality by up to 30%.
• Sustainable Materials (Green Building): Materials that are sourced locally, recycled, or sustainably harvested to reduce the environmental impact of construction. Real-world implication: Sustainable materials can reduce waste by up to 50% and decrease the carbon footprint of buildings by up to 30%.
• Energy Efficiency (Green Building): Strategies that reduce energy consumption in buildings through design, materials, and operations. Real-world implication: Energy-efficient buildings can reduce energy consumption by up to 50% and decrease greenhouse gas emissions by up to 30%.
• Water Conservation (Urban Planning): Strategies that reduce water consumption in urban areas through efficient appliances, rainwater harvesting, and greywater reuse. Real-world implication: Water conservation measures can reduce water consumption by up to 50% and decrease wastewater generation by up to 30%.
• Waste Management (Urban Planning): Strategies that reduce, reuse, and recycle waste in urban areas to minimize landfill disposal. Real-world implication: Effective waste management can reduce greenhouse gas emissions by up to 20% and decrease waste sent to landfills by up to 50%.
• Smart Growth (Urban Planning): A development approach that promotes compact, walkable, and mixed-use communities to reduce sprawl and promote sustainability. Real-world implication: Smart growth can reduce greenhouse gas emissions by up to 20% and increase physical activity among residents by up to 30%.

Step-by-Step Application

1. Calculate the carbon footprint of a city: Use a carbon footprint calculator to estimate the greenhouse gas emissions of a city based on factors such as energy consumption, transportation, and waste management.
2. Evaluate an environmental impact assessment (EIA): Review the EIA report to identify potential environmental impacts of a development project, such as air and water pollution, and recommend mitigation measures.
3. Predict population growth using the rule of 70: Use the rule of 70 to estimate the number of years it will take for a city's population to double based on its current growth rate.
4. Design a green building: Use the LEED certification system to design a green building that meets energy efficiency, water conservation, and sustainable materials standards.
5. Develop a public transport system: Use a transportation model to design a public transport system that reduces reliance on personal vehicles and promotes walkability and bikeability.

Common Misconceptions

• Misconception: "Green buildings are more expensive to build and maintain."
• Correction: While green buildings may require an initial investment, they can reduce energy consumption and water usage, leading to long-term cost savings and increased property values.
• Misconception: "Public transport is only for densely populated cities."
• Correction: Public transport can be effective in cities of all sizes, and can be designed to accommodate different population densities and transportation needs.
• Misconception: "Green roofs are only for aesthetic purposes."
• Correction: Green roofs provide insulation, reduce stormwater runoff, and create habitats for urban wildlife, making them a valuable component of sustainable urban design.

Exam/Free-Response Tips

• Multiple-choice traps: Be careful of questions that seem too easy or too obvious, as they may be designed to test your understanding of a related concept.
• Free-response questions: Use specific examples and data to support your answers, and be sure to address all parts of the question.
• Tricky distinctions: Be careful to distinguish between related concepts, such as weather vs climate, primary vs secondary succession, and bioaccumulation vs biomagnification.
• Framing answers: Use a clear and concise writing style, and be sure to address all parts of the question.

Quick Practice Scenario

Scenario: A city is considering a new development project that will increase the population by 10,000 residents. The city's current population is 100,000, and its growth rate is 2% per year. Using the rule of 70, how many years will it take for the city's population to double?

Answer: 35 years

Explanation: Using the rule of 70, we can estimate the number of years it will take for the city's population to double based on its current growth rate. The rule of 70 states that the number of years it will take for a quantity to double is equal to 70 divided by the growth rate. In this case, the growth rate is 2% per year, so the number of years it will take for the city's population to double is 70 / 2 = 35 years.

Last-Minute Cram Sheet

• LEED certification: A rating system for green buildings that promotes energy efficiency, water conservation, and sustainable materials.
• Compact urban form: A design approach that promotes walkability, bikeability, and mixed-use development to reduce the need for personal vehicles.
• Public transport: A transportation system that promotes the use of buses, trains, and other shared modes of transportation to reduce reliance on personal vehicles.
• Green roofs: Vegetated roofs that provide insulation, reduce stormwater runoff, and create habitats for urban wildlife.
• Urban heat island effect: The phenomenon where urban areas experience higher temperatures than surrounding rural areas due to the urban heat island effect.
• Sustainable materials: Materials that are sourced locally, recycled, or sustainably harvested to reduce the environmental impact of construction.
• Energy efficiency: Strategies that reduce energy consumption in buildings through design, materials, and operations.
• Water conservation: Strategies that reduce water consumption in urban areas through efficient appliances, rainwater harvesting, and greywater reuse.
• Waste management: Strategies that reduce, reuse, and recycle waste in urban areas to minimize landfill disposal.
• Smart growth: A development approach that promotes compact, walkable, and mixed-use communities to reduce sprawl and promote sustainability.
• Tragedy of the commons: A concept that describes the overexploitation of shared resources when individuals act in their own self-interest.
• First Law of Thermodynamics: Energy cannot be created or destroyed, only converted.
• Rule of 70: A formula for estimating the number of years it will take for a quantity to double based on its growth rate.