1. If people stopped using cars completely, there ... ( be ) much less pollution. 2. If people ... ( buy ) more recycled paper, there wouldn't be so much waste. 3. If we ... ( not bury ) Chemical waste underground, we ... ( not pollute ) fresh water supplies. 4. Pollution ... ( not be ) such an issue if governments and common people really ... ( care ) . 5. What ... ( happen ) if the whole world ... ( be ) full of pollution? 6. If people ... ( pay ) a little more attrntion to the environment, the Earth ... ( be ) greener. 7. If people no longer ... ( pollute ) the atmosphere, the air ... ( soon become ) clean again.