The causes underlying the collapse of civilizations are usually traced to overuse of resources. As we write this, the world is reeling from economic chaos, peak oil, climate change, environmental degradation, and political turmoil. Every day, the headlines re-hash stories of scandal and betrayal of the public trust. We don't have to make outraged demands for the end of the current global system - it seems to be coming apart already. But acts of courage, compassion and altruism abound, even in th...