As the earth spins through space, a view from above the North Pole would encompass most of the wealth of the world - most of its food, productive machines, doctors, engineers and teachers. A view from the opposite pole would encompass most of the world's poor.

After all, despite the economic advantage to firms that employed child labor, it was in the social interest, as a national policy, to abolish it - removing that advantage for all firms.

All of the clean technologies are known, it's a question of simply applying them.

In certain ways, I'm not very different than I was when I was a teenager.

Square Roots creates campuses of climate-controlled, indoor, hydroponic vertical farms, right in the hearts of our biggest cities.

I hope my kids can experience the seasons and a climate that's sustainable. The idea that things are going to be so very different for them is slightly scary.

If you look around the world, the countries with the best environmental practices are the wealthiest. There's a reason for that. If you're worried about where your next meal is going to come from or shelter over your head, your focus is on those things.

That's the big mistake the environmental movement made - 'We'll scare the hell out of you, and you'll become an activist'.