Across
- 2. In a way that uses time and energy well
- 3. To work or control a machine or system
- 5. Able to continue for a long time without harming the environment
- 8. The basic systems and services a city needs to function (roads, transport, etc.)
- 9. Related to protecting the natural world
- 10. city A city that uses technology to improve living conditions
Down
- 1. A tall building with many floors
- 4. Gases released into the air, often from vehicles or factories
- 6. The art and design of buildings
- 7. Easy and comfortable to live in