Everyone around the world knows that our environment is now seriously polluted. Why is this happening? Because of our perception! We didn't care about the environment, so we threw the garbage without concern. And of course, the river isn't as clean as it used to be, the air isn't as clean as it used to be, and the food isn't as fresh as it used to be. So, what must we do to keep our environment clean? We must raise awareness: do not litter. We must educate everyone about the importance of the environment. We want to live we must protect the environment, protect the Earth, save our lives.