There are fewer and fewer people who are still available that you might infect, and then you get the plateau of the curve, and you get this classic sigmoidal curve.

Last point, last graph. One of the things that we've got to do is to stabilize oil prices. This is what oil prices look like, OK?

You can take virtually any parameter that matters for human well being nitrous oxide, methane, deforestation, overfishing land degredation, loss of species they all show the same pattern over the past 200 years.

Inequalities in China and India I consider really the big obstacle because to bring the entire population into growth and prosperity is what will create a domestic market, what will avoid social instability, and which will make use of the entire capacity of the population.