A principle I have on corporate rights and restrictions:
Any rights you would give a person, give to corporations.
Any restrictions you would give a person, give to corporations.
So, just apply any environmental restrictions you'd put on people, and put them on corporations, and vice versa.

I have a utilitarian free-market stance on the environment. Look at the story of the Lorax, for example. If the once-ler had been environmentally responsible, he'd still be in business. Business exists to sell the Earth's natural resources to you, the consumer. They cannot do this if there are no natural resources. For that matter, being environmentally responsible does work in your favor in a marketing sense.