I agree that a singular focus on efficiency without regard for unintended side effects or negative externalities is crazy too. "Sustainability" should be right

I agree that a singular focus on efficiency without regard for unintended side effects or negative externalities is crazy too. "Sustainability" should be right up there with efficiency as a main tool - doing something efficiently in an unsustainable way (societally, economically or ecologically) will by definition not be efficient in the long term anyway - but our society is often organized in a way where those who benefit from short term profits are not the same as those who must bear the long term costs, so they don't balance out like ideally they should. So the effort should be put into aligning those incentives, make it unprofitable to chase short-term profits in ways that harm society - not to fight efficiency as a concept.