Triple bottom line
Here's a trio which should get your mental juices flowing:
 If we do nothing to prevent catastrophic climate change happening, then those catastrophes, collectively, will crash the global economy.
 If we take the measures required to prevent catastrophic climate change, we will crash the global economy.
 Accepting that the size of the global population is the biggest elephant in the room, and if something were to happen which brought it down to a sustainable size in time to prevent catastrophic climate change, the economy would crash.
Ergo, the economy will crash.
We are now merely arguing about the best way to deal with it.