Factories dump waste into rivers. A lot of fish die.

• If factories dump waste into rivers, a lot of fish will die.

People use plastic bags. Oceans are full of plastic garbage.

• If people use plastic bags, oceans will be full of plastic garbage.

I walk to school. I save a lot of money.

• If I walk to school, I will save a lot of money.

People build too many houses. Land for farming decreases.

• If people build too many houses, land for farming will decrease.

The Earth becomes hotter. The polar ice cap melts.

• If the Earth becomes hotter, the polar ice cap will melt.

The polar ice cap melts. Sea level rises.

• If the polar ice cap melts, sea level will rise.

We use recycled products. We help the environment.

• If we use recycled products, we will help the environment.

We breathe polluted air. We suffer from lung diseases.

• If we breathe polluted air, we will suffer from lung diseases.