Do we have a moral obligation to lessen our impact on our environment?

If so, is that obligation rooted in the Divine (God made the Earth, and we must respect God's creation), some responsibility to future generations (we must leave our children a better world than we ourselves received), or is there room for self interest (example: toxic fumes from a chemical plant in my town are carcinogenic, and I don't want cancer, so we should treat our environment with greater respect). Is there a way to combine the three? Am I missing a necessary facet of the discussion?