Complete these sentences with the correct form of the words in brackets:

1 What can we do to reduce the ………... (pollute) of the atmosphere?

2 The change in the climate has produced ……….. (disaster) floods.

3 Many rare species are threatened with …….. (extinct).

4 Many of the gases produced by factories are ………. (harm) to our health.

5 Exhaust fumes have ………. (damage) effects on the environment.

6 Many countries must try and control the growth of the ……….. (populate).

7 Protecting the environment is essential to our ……… (survive).

8 The ………. (protect) of the environment is everyone’s responsibility.

9 While some countries get richer, the ………. (poor) in others gets worse.

10 Millions of people in the world are threatened with ………. (starve).