How do cities succeed in the age of climate consequences? 2012 saw some of the most extreme weather events ever recorded, from record floods to rising seas, polar ice melt to epic droughts, Australian megafires to Hurricane Sandy's unprecedented storm surge. At the same time, urbanization has hit a breakneck pace, with increasingly cosmopolitan cities around the world pushing a new wave of technological innovations and urban solutions. How does a planet of cities respond to a planet in crisis — and what does that mean for us? In a special evening talk with SPUR, Alex Steffen — one of the world's leading voices on sustainability and the future of cities — presents his provocative ideas for understanding how urbanization can save the planet, and how San Francisco and the Bay Area can thrive amidst massive change. Watch Alex's TED Talk, "The Shareable Future of Cities," and read his new book, Carbon Zero. Cocktail reception to follow.