"Cities are the crucible of civilization."

“Everything around us is scale dependent. It's woven into the fabric of the universe.”

“I’ve always wanted to find the rules that govern everything. It’s amazing that such rules exist. It’s even more amazing that we can find them.”

“A human being at rest runs on 90 watts. That’s how much power you need just to lie down. And if you’re a hunter-gatherer and you live in the Amazon, you’ll need about 250 watts. That’s how much energy it takes to run about and find food. So how much energy does our lifestyle require? Well, when you add up all our calories and then you add up the energy needed to run the computer and the air-conditioner, you get an incredibly large number, somewhere around 11,000 watts. Now you can ask yourself: What kind of animal requires 11,000 watts to live? And what you find is that we have created a lifestyle where we need more watts than a blue whale. We require more energy than the biggest animal that has ever existed. That is why our lifestyle is unsustainable. We can’t have seven billion blue whales on this planet. It’s not even clear that we can afford to have 300 million blue whales.”

“Every fundamental law has exceptions. But you still need the law or else all you have is observations that don’t make sense. And that’s not science. That’s just taking notes.”

“It’s hard to kill a city, but easy to kill a company.”

“The paradigm of physics - with its interplay of data, theory and prediction - is the most powerful in science.”