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Light Pollution
One-fifth of the world's population cannot see the Milky Way at night because of so-called sky glow. This NASA composite image of Earth at night shows particularly impacted areas like Europe, Japan, and North America

Light pollution generally refers to human-designed, artificial lighting that illuminates areas other than those the light was designed to illuminate. A classic example of light pollution would be a streetlight that is constructed to illuminate a sidewalk or street to allow walkers and motorists to travel with greater ease and safety at night. Depending on the design and construction of the light fixture, the light can either be directed directly to the ground beneath it or, alternatively, can release light in every direction. ...
- City Organizations, Movements, and Planning
- Agenda 21
- Brownfields
- Carrying Capacity
- Charrette
- City Politics
- Civic Space
- Ecoindustrial Parks
- Environmental Impact Assessment
- Environmental Planning
- Green Communities and Neighborhood Planning
- Green Design, Construction and Operations
- Greenfield Sites
- Infrastructure
- Intermodal Transportation
- Millennium Development Goals
- Mitigation
- NIMBY
- Personal Rapid Transit
- Resilience
- Sustainability Indicators
- Sustainable Development
- Transit-Oriented Development
- Transportation Demand Management
- City Profiles
- Austin, Texas
- Bahía de Caráquez, Ecuador
- Bangkok, Thailand
- Barcelona, Spain
- Beijing, China
- Bogotá, Colombia
- Chattanooga, Tennessee
- Chernobyl, Ukraine
- Chicago, Illinois
- Copenhagen, Denmark
- Curitiba, Brazil
- Dongtan, China
- Dzerzhinsk, Russia
- Hamburg, Germany
- Kabwe, Zambia
- Kampala, Uganda
- La Oroya, Peru
- Linfen, China
- London, England
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- Malmö, Sweden
- Mexico City, Mexico
- New York City, New York
- Norilsk, Russia
- Portland, Oregon
- Reykjavik, Iceland
- Rio de Janeiro, Brazil
- San Francisco, California
- Seattle, Washington
- Stockholm, Sweden
- Sukinda, India
- Sumgayit, Azerbaijan
- Sydney, Australia
- Tianying, China
- Vancouver, Canada
- Vapi, India
- Green City Challenges
- Adaptation, Climate Change
- Adaptive Reuse
- Air Quality
- Biodiversity
- Carbon Footprints
- Coastal Zone Management
- Combined Sewer Overflow
- Commuting
- Construction and Demolition Waste
- Denitrification
- Density
- Ecological Footprint
- Ecosystem Restoration
- Embodied Energy
- Energy Efficiency
- Environmental Justice
- Environmental Risk
- Food Deserts
- Food Security
- Garbage
- Greywater
- Gridlock
- Heat Island Effect
- Indoor Air Quality
- Landfills
- Light Pollution
- Natural Capital
- Nonpoint Source Pollution
- Ports
- Power Grids
- Recycling in Cities
- Sea Level Rise
- Stormwater Management
- Transit
- Waste Disposal
- Water Conservation
- Water Pollution
- Water Treatment
- Water, Sources and Delivery
- Watershed Protection
- Wetlands
- Green City Solutions
- Bicycling
- Biophilia
- Bioregion
- Bluebelts
- Bus Rapid Transit
- Carbon Neutral
- Carbon Trading
- Carpooling
- Cities for Climate Protection
- Citizen Participation
- Combined Heat and Power (Cogeneration)
- Community Gardens
- Compact Development (New Urbanism)
- Composting
- Congestion Pricing
- Conservation Subdivision
- Daylighting
- Distributed Generation
- District Energy
- Ecovillages
- Green Belt
- Green Energy
- Green Fleets (Vehicles)
- Green Housing
- Green Infrastructure
- Green Jobs
- Green Landscaping
- Green Procurement and Purchasing
- Green Roofs
- Greening Suburbia
- Greyfield Development
- Habitat Conservation and Restoration
- Healthy Cities
- Historic Preservation
- Infill Development
- LEED (Leadership in Energy and Environmental Design)
- Location-Efficient Mortgage
- Masdar Ecocity
- Mayors Climate Protection Agreement
- Parks, Greenways, and Open Space
- Renewable Energy
- Smart Growth
- Traffic Calming
- Universal Design
- Urban Agriculture
- Urban Forests
- Walkability (Pedestrian-Friendly Streets)
- Xeriscaping
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