现在环境问题：包括污染现象，原因，应对措施（英语，字数100~250）

water pollution
原因;some factories are dump their waste into the river ,the posion in the river polluted the river
the govenmentare not realize the water pollution is very terrible
应对措施: write to the govenmentto tell them that the water pollution is very terrible
We should treasure our water resource！