Christians believe that God created the world and we do not own it but we are instead stewards of this world. This means that God made the world for us to look after. This can be proved in the Genesis: "God took the man and put him in the Garden of Eden to work it and take care of it" (Genesis 2:15). This clearly proves that God wants to take care of the world
If God made the world, then we should clearly look after it and leave it in a good state like when it was first given to human kind. In addition to this, Christians also believe that Jesus will come at the end of time to judge the world.
This is all I could remember about Christian views. When I said Christians I was also referring to Catholics.