Lagarde’s last challenge to me was that land is not going to become an information technology, and that we are already very crowded. I replied that we are crowded because we chose to crowd together in dense groups. Cities came about to make possible our working and playing together. But try taking a train trip anywhere in the world and you will see that almost all of the habitable land remains unoccupied—only 1 percent of it is built up for human living.[215] Only about half of the habitable land is directly used by humans at all, almost all of it dedicated to agriculture—and among
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