I think that environment is important to us.
At first, the enviroment gives our resources.
We can gain cloth and food at the enviroment.
On second, the enviroment cleans our air.
Though the air is very dirty, the trees in the enviroment
can clean the dirty air.
This is why i think that the enviroment is very important.

Explanation: Importance is a noun and important is an adjective. Us is used after a verb or preposition to mean the person who is speaking and one or more other people. The preposition before us in the sentence is to. There are phrases that need to be removed because they aren't appropriate or necessary to the sentence.

Hello, Sally! Thank you for submitting your homework! I think you need to improve your written English. Nevertheless you did a good job!:)