A four-year analysis of the world's ecosystems sponsored by the Worldwatch Institute found that over-consumption has pushed 15 out of 24 ecosystems essential to human life "beyond their sustainable limits". Our insatiable desire for more is moving the planet toward a state of collapse that may be "abrupt and potentially irreversible".

You don't know why?

I think it's a rhetorical question.

Ah, Yes, I can see that now.

But the image of some poor soul, in anguish, pleading for answers, deserved some sort of comment.