Doubtless, people are optimistic that sustainability is possible. Pessimism is enervating and deflating. However, both optimism and pessimism are merely states of mind that have little connection with reality. What we really need is a good dose of realism, and from this perspective much of what we take to be progress is delusional. It creates a false – or at least inflated – sense of achievement, and thus relieves the psychological and political pressure needed for real change. ...