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If there's a camera on me or off me, it's roughly the same, just a lot less energy.

I ride my bike for transportation a great deal - occasionally I ride it for fun. But I also have a generator bike that's hooked up to my solar battery pack, so if I ride 15 minutes hard on my bike, that's enough energy to toast toast, or power my computer.

Mobile devices such as Android and the iPhone achieve their battery life largely because they can aggressively and quickly enter into and exit from sleep states. GPS prevents this.

I keep hearing about battery innovation, but it never makes it to my phone.

Energy-saving technologies keep improving faster than they're applied, so efficiency is an ever larger and cheaper resource.

Every one of today's smartphones has thousands of times more processing power than the computers that guided astronauts to the moon.

In the south of France the phones cut in and out, the electricity isn't particularly reliable. I think many people would get very irritated with that life.

I think the discipline comes with turning that cellphone and Blackberry off and unplugging completely. You do that and you go through some withdrawals in the beginning. You start thinking, 'Oh, do I need to do this? Do I need to do that?' You forget that we were doing just fine with the payphone.

The telephone is a 100-year-old technology. It's time for a change. Charging for phone calls is something you did last century.

Carpooling is important for urban density, air pollution and other reasons, but carpooling is not the kind of thing that actually changes the energy equation.