we might ask which path we are on. One trajectory, with Moore's law underwriting endless technological wizardry, promises a future in which humanity itself might be redefined. At the rate with which we are using up the earth's resources, another trajectory threatens potential disaster ahead for humanity. Which of these is more likely to be humanity's actual path? And, even more crucially, is there a way our civilization can somehow be steered to achieve a sustainable path for humanity's future—a path in which progress might mean something other than consuming the earth?