1. What would happen if water pollution stopped/What will happen if water pollution stops ?             
2. Will we happy if air pollution in the world is a better place?                                                                 
3. If there was/were no more pollution, would the world be a better place?                                         
4. If I were you, I would take these bottles to the bottle bank.                                                       
5. If people don't really care about the environment, they won't try to save it.                                   
6. The river won't be so polluted if factories don't dump watse( đổ rác ) it.                                     
7.  We wouldn't less worried if oil spills didn't have such destructive effects.                                   
8.  If we destroys the ozone layer, what will save us from the UV rays ( tia UV ).