What heavenly good is earth?

We pray the Lord’s Prayer, “… Thy will be done on earth as it is in heaven…” But what does that mean? Jesus told Peter, “And I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.” There is something about the connection between heaven and earth that is undeniable. And yet … we are told not to love this world, or the things of this world. So where is the balance? Should we even bother with taking care of the earth, or taking care of our earthly bodies, … isn’t all just worm food anyway and what really matters is eternity in heaven?