Bill McKibben on global warming

Environmental activist Bill McKibben warned of the dangers of global warming 20 years ago. His latest book takes an angrier edge as he urges a change in our lifestyles or risk living in an inhospitable world.

Guests

• Bill McKibben: Environmentalist and founder of 350.org, an international climate campaign. His latest book is called "Eaarth." The creative spelling is intentional.

Resources

• About Bill McKibben