Pollution

Pollution is one of the biggest problems all over the world. Our earth is getting dirtier because we don't do the right things.
A good environment can help us study better and so on, so we should protect it.
There are many cars in the modern world, it is very convenient, but it is bad for our environment, and it makes lots of pollution. A busy traffic makes people angry.
I think people should walk to work or study. On the one hand, it's good for our environment, on the other hand, you can save money and it's good for your health. Why not do that?
There are many things you can do for environment, you should take your bag when shopping, you'd better not waste water, you sholdn't turn on the TV when you go out.
You just do a little, your earth can get cleaner and more beautiful. It's our duty to make the earth happy!