b) Complete the sentences. Use: prevent, save, raise, reduce, ban, fine, invest.

1 The best way to stop the polar ice caps shrinking is to save energy.

2 We should fine factories that don't use alternative methods of disposing waste.

3 To fight climate change, we can reduce the amount of electricity we use.

4 We can prevent the hole from getting bigger by not buying aerosol sprays that use CFCs.

5 The government should ban cars from the city centre.

6 Governments need to invest in wind power and solar energy projects.

7 We ought to raise money for charities that run conservation projects.