now,the problems of the earth are getting more serious.for example,the rivers are not clean and
the air is not fresh.why would it be?because we didn't protect it .in the past,people pay no attention to the environment.but now,we changed.we know the importance of environment.we take actions to protect it,and what should we do?yes,it's our duty to protect the environment.we should use less water and cherish it,we also can take more bus than drive cars,i believe that if we do this the environment wlii become better.
没有注意大小写,凑合一下吧!