Hill claims that a fruitful way to think about the badness of destroying the environment is:

To think about what kind of human would choose to destroy the earth.
To appeal to theories about God and care for the earth.
To examine people’s intuitions about whether it is right to harm the environment.
To examine the rights that belong to the environment and act on the basis of those rights.

I don't know what Hill claimed, but I like the last choice.