Let me give you just a couple of numbers. If you take your body—your metabolic rate as a human it’s just an animal, you eat food, that’s your metabolism—you burn about a 100 Watts. Your power, your body is the same as a 100-Watt lightbulb. We’re incredibly efficient. Your brain is about 60 Watts of that. Amazing. But if you extrapolate in developed countries where we use a lot of energy, on average in developed countries our civilizational metabolic rate is 11,000 Watts. So, in a natural state, where we’re animals, we’re only using a 100 Watts. In our actual developed-world state, we’re using 11,000 Watts. And it’s growing. For a century or more, it’s been compounding at a few percent a year—our energy usage as a civilization.

I really like that.