Thank you for doing your homework, Min!

Here are some corrections:

The only way to protect wild animals' habitats is to protect the environment. Like everyone knows, there are plenty of ways to keep the environment healthy; for example we can recycle paper and glass. Yes, we do know and have knowledge why we must not pollute and damage the earth, including the ocean, mountains, tropical rain forests and the South and North pole. However, the real problem is(-)that we don't follow those things although we already know how. The information and knowledge is are useless if you don't use them in real life. That laziness is the main reason of the pollution and lack of trees both for us and animals. It's important for us to act as we are told to do some ways to keep the earth healthy for animals and human-beings. (I know it's quite hard to do-though it's simple'LoL)

Note:
-Use Articles if necessary