Which is more important, your employer or the environment?

A question for anyone who dares answer - and this is assuming that your employer isn't a world leader in environmental CSR. Given the overwhelming evidence toward climate change, and taking into account what Ban Ki-moon said yesterday in regard to the urgency at which we must change our attitude toward carbon pollution... Do you feel that there is a moral imperative for Procurement & Supply Chain pros to always chase the greenest outcomes for their business regardless of the price, or do you feel that your obligation is to your employer/shareholder and that price and value should always be the number one goal?