1. If we don't reduce plastic waste, our oceans ______ become even more polluted.
2. Scientists say that the polar ice caps ______ melt completely within the next century if global warming continues unchecked.
3. To protect wildlife, we ______ destroy their natural habitats.
4. If everyone made a small effort, we ______ make a big difference for the planet.
5. We ______ conserve water, especially in drought-prone areas, to ensure future supply.
6. "______ I volunteer for the beach clean-up this Saturday?" asked the student.
7. Recycling is not just a good idea; it's something we all ______ do to lessen our impact.
8. If climate change continues at its current rate, sea levels ______ rise significantly.
9. Pollution levels in this city are so high, it ______ be dangerous to breathe the air.
10. People who live near the forest ______ be careful about starting fires, especially in dry seasons.
11. To truly combat deforestation, governments ______ implement stricter laws and penalties.
12. If ancient forests are cut down, many unique species ______ lose their homes forever.
13. We ______ reduce our carbon footprint if we want to leave a healthy planet for future generations.
14. "______ you please turn off the lights when you leave the room to save energy?"
15. Even a small change in our daily habits ______ contribute to a more sustainable lifestyle.