The Earth is Full

I always think of Thomas L. Friedman as a moderate on global issues.  In a recent editorial he asks the question:
" How did we not panic when the evidence was so obvious that we’d crossed some growth/climate/natural resource/population redlines all at once?"....

" when food prices spiked, energy prices soared, world population surged, tornados plowed through cities, floods and droughts set records, populations were displaced and governments were threatened by the confluence of it all — and ask ourselves: What were we thinking?"

Friedman refers to Paul Gilding,  the veteran Australian environmentalist who says we're definitely in denial:
Right now, global growth is using about 1.5 Earths. “Having only one planet makes this a rather significant problem”.

What happens when we live at 150% of sustainable capacity?