Kari visits New York, where people work to make the city more livable.

Kari ventures to Doha, Qatar, to discover how people survive in the desert.

Kari visits Israel and discovers many ways to achieve peaceful coexistence.

Kari learns about efforts to feed the growing world.

Kari dives into the ongoing urban experiment known as Berlin.

Kari visits one of the United States' top tech capitals.