How can we potect our environment?

Today I read a book. This book about our environments is in danger.
There are air and water on the Earth.
There are people and plants on the Earth. People have lived on the Earth for millions of years. Many years ago, the air was fresh, the water was clean, the sky was blue, animals were happy. Everything was beautiful, everything were nice. But today, everything is different. There air pollution.
Factories in the towns and cities drained waste liquid to the lakes, rivers and seas. Waste gases from cars and factories make the air dirty. People are killing more and more animals. People use their furs to make coats; people use their meat for food. More and more animals are disappearing from the Earth forever.
People are polluting the land, polluting the water, polluting the air! People must stop the pollution. Let’s protect our together!
I say:my english is not good,i just want to give a chance to myself ,so i use english,if something wrong ,i'm sorry!