Saulgoldie says "...but...the issue is *sustainability.* "

In the context of the article cited, isn't it more about "pileability"?

Bobert wants a recount: The official estimate by the UN committe on population (whatever its real name is) is that on 31 May 2011 the world population will become three billion.

3,000,000,000 or 3x10⁹.

John