Across
- 1. is an increase world temperature.
- 4. sustainable transportation.
- 7. pollution in form of rivers,streams,lakes and seas flooded with waste materials.
- 8. rain contaminated with harmful acids,which causes damage to environment.
Down
- 2. a layer of concentrated ozone gas.
- 3. the process of collecting and processing materials that would otherwise be thrown away as trash and turning them into new products
- 5. are electricity network that use digital technologies, sensors and software.
- 6. lighting technology that replaced traditional bulbs.