Tuesday, March 24, 6 p.m.
Commonwealth Club (110 The Embarcadero)
What if the Earth’s carrying capacity is limited to three billion humans and humanity’s century-long binge has caused an unsustainable ecological debt that must be paid down promptly or else cataclysm awaits? Hear what Christopher K. Tucker of the American Geographic Society has to say. $20, 415-597-6705, commonwealthclub.org