Mobilizing to save civilization means restructuring the economy, restoring the economy's natural support systems, eradicating poverty, and stabilizing population. We have the technologies, economic instruments, and financial resources to do this. The United States has the resources to lead this effort. Jeffrey Sachs of Columbia University's Earth Institute sums it up well: "The tragic irony of this moment is that the rich countries are so rich and the poor so poor that a few added tenths of one percent of GNP from the rich ones ramped up over the coming decades could do what was never before possible in human history: ensure that the basic needs of health and education are met for all impoverished children in this world. How many more tragedies will we suffer in this country before we wake up to our capacity to help make the world a safer and more prosperous place not only through military might, but through the gift of life itself?"
It is not possible to put a precise price tag on the changes needed to move our twenty-first century civilization off the overshoot-and-collapse path and onto a path that will sustain economic progress. What we can do, however, is provide some rough estimates of the scale of effort needed.