3.文章开头已经给出，不计入总词数。参考词汇：校园安全 safety at school.
With the global warming getting worse, more people choose to live a low-carbon life for the purpose of reducing greenhouse gases. As students, we have the responsibility to change our lifestyle to fit the world better. The following are some small things that may lead to improvement of the environment.
First, wash your clothes by hand instead of using washing machines. Second, don’t take elevators unless it is necessary. Climbing stairs does good to your health and environment. Third, remember to bring your own shopping bags when you go to the supermarket. Last, go to school on foot or by bicycle. Buses produce carbon dioxide, too.
Let’s take action and be low-carbon people from now on.