““Depression is becoming an increasingly serious problem. In the United Kingdom, for example, prescriptions for antidepressant drugs have risen by more than forty percent in the past four years. This is not a uniquely British problem. On the contrary, the World Health Organization predicts that by 2020 depression will be the second leading cause of death in the world, affecting thirty percent of all adults. Many experts believe that depression has become an epidemic. By some estimates, “clinical depression is ten times more likely to torment us than it did a century ago.””