Deep "thinking" from Air America host Thom Hartmann

Excerpt from this article:

Hartmann’s main argument is that oil (stored sunlight) has allowed untrammeled population growth. Nowadays, it takes about 12 years to add one billion people to the global population. So, sooner or later we face the uncomfortable transition from the population level that peak oil production can sustain, to the level current sunlight (think “renewable energy”) can sustain.

Hartmann suggests this population is somewhere between a quarter of a billion and one billion people.

Note that the current world population is somewhere around 6.6 billion people.