Vinay Gupta :
But there's no way around this: we're at four times consumption in Europe, and something like eight times consumption in America. Can you imagine us cutting our consumption, on average, by 80%? That's what we need to do. Maybe we'll get the Hail Mary pass on Nanosolar or Konarka, I think there's a very good chance we're going to get to the Cheap Energy, Cheap Information future, but even then, it's still going to be about a nine billion person split. I think we can produce a very good hexayurt out of about 100 lbs of paper and thick aluminium foil, all recycled and recyclable. I think the biosand filter and the rocket stove are pretty much ready for prime time technologies for our basic human needs, and the toilets are only a little further behind. And that's a standard of living, that and a cheap Android tablet that's been engineered to last for three decades, that's a standard of living which you can make sense of at nine billion, which is our likely peak population. We're going to hit seven billion right around the time this piece is published, and it's important to think about it in these big number terms, because that's the world we really live in.