It takes less land to grow a pound of broccoli than it does a pound of beef. Less land to grow a pound of grain than a pound of beef. Less water, less energy.

I'm a strong proponent of green tech for anyone who can afford it, having spent the last 40 years working toward achieving a smaller and smaller eco-impact for myself.

I think people love nature after they experience it. I know I experienced it as a young man - I took a lot of hikes, I was involved in scouting.

The two most abundant forms of power on earth are solar and wind, and they're getting cheaper and cheaper.

My favorite form of transportation is walking. I live in a neighborhood where you can walk to restaurants, banks, and shops.

What we often fail to recognize is how efficient a vegan diet is. Less land, less water, more food for our spiraling population.

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.