I have no idea how it happened, but during the fifth Skoll World Forum on social entrepreneurship late in March, I managed to slice open a knuckle. It happened when my mind was elsewhere. The theme of the event, held at the Saïd Business School in Oxford, was culture—and I was talking over lunch with an American who was trying to persuade me to help Disney (who have played a key role in defining our consumer cultures) engage the rapidly evolving world of social and environmental entrepreneurs. It was he who kindly pointed out that I was bleeding profusely, which later struck me as a metaphor for some of the challenges the world now faces—and which Al Gore would spotlight in an extraordinarily speech the next morning.