, environmental pollution becomes a big social problem.

Burning coal and oil pollutes the air, and it    our health .

Make a proposal(发出倡议书）.

Some useful expressions:

close down the polluted factories;

help to clean up the river/parks;

plant more and more trees.

ride a bike;

bring a cloth bag to go shopping;

turn off the lights when you leave a room;

Don't use plastic bags any more;

recycle books and paper;

Don't throw litter into the river;

Save the earth

It's everyone's duty to protect the environment. And it should begin from every aspect of our daily life.

……

We should remember: Lucid waters and lush mountains are invaluable assets.