Sustainability twenty years later

The GEO reports which UNEP publishes every five years always make a stimulating read.

It was largely GEO 3, the previous one, that publicized the fact that we'll need two extra planets if we continue to consume the one we have at the current pace.

GEO 4 just came out this week. A review of the state of the world 20 years after the word "sustainability" was coined in 1987 by the Brundtland report.