5 задание Make one sentence out of two using if, when,

5 задание
Make one sentence out of two using if, when, until, till, etc.
The sea level is rising. We need to do anything about global warming. The sea level will rise if we dont do anything about global warming.
1) The animals are getting extinct. We need to protect them.
2) We need to save fuel. Were going to run out of it in future.
3) We need to protect our lakes and rivers. They are becoming polluted. 4) We need to stop cutting down rainforests. The hole in the ozone layer is getting bigger.
5) We need to stop global warming. Temperatures are going to rise further.