This is the title of a plan of action by Lester Brown, which is freely available in several versions, including:
Lester Brown, Plan B 2.0: Rescuing a Planet Under Stress and a Civilization in Trouble, Earth Policy Institute, 2006.
Lester Brown, Plan B 3.0: Mobilizing to Save Civilization, Earth Policy Institute, 2008.
Lester Brown, Plan B 4.0: Mobilizing to Save Civilization, Earth Policy Institute, 2009.