3. Plastic is non-biodegradable. They will remain in the environment for many years. (therefore) 4. Plastic is non-biodegradable. They will remain in the environment for many years. (since) 5. Water pollution happens. Many aquatic animals die. (lead to) 6. Water pollution happens. Many aquatic animals die. (as a result) 7. The fish and other aquatic animals have died. The water is polluted. (due to) 8. Factories dump sewage into rivers and lakes. They are poisoned. (since) 9. Factories dump sewage into rivers and lakes. They are poisoned. (consequently) 10. The climate is changing. The earth is getting warmer. (because) 11. The food is contaminated. People’s health is poor. (result in) 12. The food is contaminated. People’s health is poor. (therefore) 13. Ice is melting. This makes the sea level rise. (because) 14. Nuclear explosions cause radioactive pollution. (lead to) 15. The environment is polluted. Birds leave their habitats and plants die. (make)