Answer 1

One possible version:

Now, more people have become aware of the importance of protecting our environment. However, there are many people not realizing it. As is shown in the pictures, some students often forget to turn off the lights when they leave the classroom, which is a waste of electricity. What’s worse, paper cups and disposable chopsticks are often used, causing harm to our environment.

   In my opinion, living a low carbon life is necessary. We can take measures and call on people around us to protect our environment. Well goes a saying that together, individuals can make a difference. For one thing, not only can we save electricity but also we can plant more trees as well as use both sides of paper. I believe what we do is bound to contribute to our environment. For another, the government should make some effective laws.

   Only when everyone lives a low carbon life can we protect our environment.