If we want a safe future, we must (1) ________ the environment. Scientists warn that (2) ________ warming is becoming dangerous. One solution is to (3) ________ renewable energy like solar or wind. At the same time, citizens should (4) ________ water and (5) ________ off lights daily. Factories must stop (6) ________ the rainforests because this increases (7) ________. Every student can help by trying to (8) ________ paper and plastics. Communities can also (9) ________ rubbish to keep the streets clean. We must not (10) ________ energy if we want to survive. The best thing is to (11) ________ trees and care for nature.