Be fruitful,' advises Judeo-Christian Scripture, 'and multiply, and replenish the earth.' Eight centuries BCE the global population was inferred to have been roughly five millions, soaring to between 50 and 60 millions when Julius Caesar fell, and escalating in the mid-17th century to about a half-billion. The significant benchmark of one billion reached circa 1804 doubled in 123 years to 2 billions in 1927, to 3 billions in 1960.Only 14 years later in 1974, 4 billions crowded the world, growi