Помогите пожалуйста,мне очень нужно,упрашиваю

2) If it gets too hot, the ice caps will melt.
3) If we leave our cars at home, the air will be cleaner.
4) If we don't protect them, tigers will disappear.
5) If the air is polluted, we won't be healthy.
6) If we don't do anything, things won't get better.