Animals will be in trouble ____ we reduce pollution. The forest won't grow back ____ we stop cutting trees. We won't be safe from earthquakes ____ we make our buildings stronger. ____ we use less energy, the Earth will get warmer. ____ we stop throwing trash into rivers, we won't have clean water. We can save more animals ____ we clean up the rivers. The air will be cleaner ____ we use less gas and more buses. People will be safer ____ they get ready for natural disasters. ____ we recycle more, we can create less waste. ____ people live in cleaner places, they will be healthier.

if / unless ?

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