If everyone played it safe, we wouldn't get anywhere.

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.

There's no doubt in my mind over the next 25 years how we drive, how we build our houses, how we fly, how we build our buildings, will all change.

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.

I generally disagree with most of the very high margin opportunities. Why? Because it's a business strategy tradeoff: the lower the margin you take, the faster you grow.

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

Everybody else is afraid to fail. I do not really care because when I fail, I try something new.