Certain food-based biofuels like biodiesel have always been a bad idea. Others like corn ethanol have served a useful purpose and essentially are obsoleting themselves.

In the next 10 years, data science and software will do more for medicine than all of the biological sciences together.

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.

The only way you multiply resources is with technology. To really affect poverty, energy, health, education, or anything else - there is no other way.

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.

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

We don't need a fuel that's cleaner, we need a fuel that happens to be cleaner, but is half the price of oil.