这是我写的一篇英语作文,帮我修改一下好吗? 万分感谢!

这是我写的一篇英语作文,帮我修改一下好吗? 万分感谢!
Fight Pollution
Nowaday,the populations of the world are more and more and more large,so the pollution in our city are serious. I know three kinds of pollution.There are water pollution noise pollution and air pollution. So we must fight pollution. In my opinion, we can't pour the pollute water into the river. We can't put the waste gas in the air as well.So I hope all of the people are responable in it. Our would will be more and more beautiful.