Your cellphone has 10 sensors, and your car has 400. But your body has none - that's going to change.

Now it will take a long time to scale biofuels, but I'm the only one in the world forecasting oil dropping in price to $35 a barrel by 2030. I'll put it on the record: Oil will not be able to compete with cellulosic biofuels. If you do it from food, the food will get so expensive you can't make fuel out of it.

The right way to build a company is to experiment in lots of small ways, so that you have plenty of room to make mistakes and change strategies.

Electric cars are coal-powered cars. Their carbon emissions can be worse than gasoline-powered cars.

Future is not extrapolation of past

I've probably failed more often than anybody else in Silicon Valley. Those don't matter. I don't remember the failures. You remember the big successes.

Setting an aggressive enough carbon-reduction goal will result in an appropriate price for carbon and will help many a renewable technology. Consumer education will help. Most importantly, though, will be the continually declining cost trajectory of the real breakthrough in clean-technology costs driven by research and innovation. In the end, private capital is the real barometer of change.