If you live in San Fran, we have some great back-to-back events to alert you to. Contributing writer Julia Whitty—author of many of our great recent environmetal pieces (here, here, and here)—is speaking about global warming tipping points at the World Affairs Council on the evening of Tuesday the 17th (details here). And our long-time contributor/goddess, Barbara Ehrenreich, is speaking at the Commonwealth Club the next day and at the Herbst Theater on behalf of City Arts & Lectures that same evening.