1. Emissions from vehicles have negative ………………..on the environment.

• tasks

• effects

• benefits

• problems

2. Using non-renewable energy sources like coal, oil  …………………a lot of carbon dioxide.

• has

• uses

• makes

• produces

3. They …………………..solar panels on the roof of the house to catch the energy from the sun.

• put

• install

• get

• have

4. Wind is one type of …………………source of energy.

• renewable

• expensive

• exhaustible

• dangerous

5. What things do they think might ………………..a big carbon footprint?

• take

• put

• carry

• create

6. I think that using biogas is abundant and ………………

• cheap

• limited

• polluting

• exhaustible

7. Solar energy is plentiful and it can be ………………….easily.

• reused

• recycled

• replaced

• reduced

8. We install solar panels on our roof for the heating and …………..water.

• hot

• cold

• dirty

• clean

9. His brother is ……………cracks in the water pipes.

• having

• taking

• checking

• producing

Wind power is one of the earliest ___________ sources of energy used by humankind.

• alternative

• polluted

• harmful

• exhausted