Conventional economics doesn't really recognize the importance of scale—the fact that we live on a finite planet, or that the economy, as a subsystem, cannot grow indefinitely into this larger, containing system. There are some biophysical limits there. The mainstream view doesn’t recognize those limits or thinks that technology can solve any resource constraint problems. It’s not that we can't continue to improve the human situation. But we have to recognize that the environment creates certain limits and constraints on that, and we can define a safe operating space within which we can do the best we can.