Complete the explanations.

1. We don’t have to create greenhouse gases; they exist naturally.
2. Greenhouse gases in the atmosphere the greenhouse effect.
3. Global warming is the of an increase in the amount of greenhouse gases.
4. Two of climate change have been hotter summers and wetter winters.
5. A is often the result of too much rain when the rivers are full.
6. A is a long period without rain, and they are more frequently now.
7. The is the air, land and water around us.
8. If you something, it is so badly damaged, it cannot be used again.
9. If something is , it works well and doesn’t waste energy.
10. is the power that comes from gas, electricity, etc.