Tham khảo
We should:
+ Plant many trees to balance oxygen and carbon dioxide.
+ Propagate people to protect the environment, do not throw waste indiscriminately
+Protect animal and animal 's living environment,....
+Penalize people who throw waste indiscriminately....
We shouldn't:
+Pollute the river,the sea,...
+ Cut dowm the forest
+ Throw waste indiscriminately.....