More recent data do not dispute these basic projections. If present trends continue, the more developed countries will make up only 16% of the world population in a little more than two decades....

More recent data do not dispute these basic projections. If present trends continue, the more developed countries will make up only 16% of the world population in a little more than two decades. Belsey and Chadwick (1992) remind us that one-fifth of the world’s population—1 billion people—remain in dire physical need.