The Five Horsemen of the Modern World: Climate, Food, Water, Disease, and Obesity

In recent decades, we have seen five perilous and interlocking trends dominate global discourse: irreversible climate change, extreme food and water shortages, rising chronic illnesses, and rampant obesity. Why can't we make any progress in counteracting these problems despite vast expenditures of intellectual, institutional, and social capital? What makes these global emergencies the "wicked problems" that resist our best efforts and only grow more daunting?

Daniel Callahan, noted author an...