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 counter-acting these problems despite vast expenditures of intellectual, institutional, and social capital?

What makes these global emergencies the 'wicked problems' that only grow more daunting?

Daniel Callahan examines these global problems and shines a light on the institutions, practices and actors that block major change.