environmental problems

2. to process used materials so they can be made into new products.
4. cutting down or clearing large areas of forests.
7. a place where large amounts of waste are buried under the ground.
10. the increase in Earth’s average temperature caused mainly by human activities.
11. when a species no longer exists anywhere on Earth.
12. gases released from a vehicle’s engine, usually harmful to the air.

1. when a solid (like ice) becomes liquid due to heat.
3. sharing a car journey with other people to reduce traffic, pollution, and costs.
5. a layer in the Earth’s atmosphere that protects us from the sun’s harmful UV rays.
6. harmful substances released into the environment (air, water, or soil) that damage living things.
8. energy sources like coal, oil, and natural gas that come from ancient plants and animals.
9. the natural home or environment where a plant or animal lives.