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 energy 2 We should . . . . . . . factories that don't use alternative methods of disposing waste. 3 To fight climate change, we can electricity we use. 4 We can the hole from getting bigger by not buying aerosol sprays that use CFCs. 5 The government should . . . . . . . . . . . . . cars from the city centre. 6 Governments need to in wind power and solar energy projects. 7 We ought to . . . . . money for charities that run conservation projects. ​