
Before it became the New World, the Western Hemisphere was vastly more populous and sophisticated than has been thought. New evidence of both the extent of the population and its agricultural advancement leads to a remarkable conjecture: the Amazon rain forest may be largely a human artifact.

Scientists at the International Soil Reference and Information Centre in the Netherlands estimate that humankind has degraded more than 7.5 million square miles of land, an area the size of the United States and Canada combined.

Medicare, Social Security, retirement, Alzheimer’s, snowbird economies, the population boom, the golfing boom, the cosmetic-surgery boom, the nostalgia boom, the recreational-vehicle boom, Viagra - increasing longevity is entangled in every one.