1) If we don't protect endangered species, they will become extinct. Unless we protect endangered species, they will become extinct

2)If we don't plant more trees the birds won't have a place to live. The birds won't have a place to live unless we plant more trees

3)If he doesn't tell people about the conservation

group, no one will join it. Unless he tell people about the conversation group, no one will join it

4)If we don't recycle our glass, it will take a million years to preak down.It will take a million years to preak down unless we recycle our glass

5)If global temperatures don't decrease, the ice caps will melt. Unless global temperatures decrease, the ice caps will melt