Open Archive Day
The ecosystem services concept aims to quantify the commercial value of all the natural resources we generally use without thinking, from the air that we breathe to the rain that waters our plants. The idea is that businesses have so far failed to protect these natural resources because they don't show up on balance sheets, and they appeared to be in unlimited supply, although we now know that they aren't and that in some respects we have already exceeded the capacity of our planet.
I learned about these things in 2011 and wrote a feature about them which is now openly accessible:
The ideas have become more widely known since then but haven't quite managed to save the world as yet. It has also been criticised by some environmentalists, eg George Monbiot, on the grounds of turning nature into just another commodity.