Planet in peril: humanity's four greatest challenges and how we can overcome them

Existential threats: the four most pressing dangers facing humankind

Strategies and obstacles: the solutions we need, and what's preventing them from being realized

Sendible steps for today's world: powerful measures we can implement right away

The middle-term goal: new international tools for the late twenty-first ceentury

The long-term goal: envisioning a mature system of global governance for the twenty-second century.