Arts

To fully understand progress, economist Michael Green says we must weigh social well-being and wealth. But by using this new measurement, he noticed something striking — the U.S. falls far behind.

Environmental activist Paul Gilding says the world has been growing too fast for too long. And now...the Earth is full. The only solution, he says, is to radically change the way we consume.

It might seem like the world is getting worse and worse. But psychologist Steven Pinker says that across the board, data suggests we've made a lot of progress. The question is — will it continue?