1) A person who sees his or her duties and obligations to the biosphere, all currently living things, and all things and people that will live in the future as being greater than his or her obligations to the shareholders of the company that employs them.
2) A person who believes—and who acts on this belief—that it is worse to be complicit in the destruction of ecosystems and the killing of species than it is to act contrary to the short term interests of an employer.
3) A person who wishes to reduce the amount of harm being done to the planet’s systems by exposing the practices causing that harm.