[DB 1506 (9); OAB 37] It is claimed that the case for a young Earth is strengthened by the calculation that the current world population could be produced from only two people in 4,000 years, using the appropriate exponential arithmetic (Henry Morris, Scientific Creationism, 1987 edition, pp.167-169). The fallacy in this claim, of course, is that the human population has not been growing at a steady rate. This is a classic One-Sided Equation, failing to consider factors that limit the population. Human population is limited mainly by its ability to feed itself, and until the past few hundred years, that limitation (combined with humanity's lower ability in the past to cope with natural catastrophes) has kept the population steady and fairly low. Only recently have we had the technology to remove these environmental limitations, resulting in a population explosion. Therefore, it is not valid to extrapolate the current rate of growth, which is much less affected by its past limitations, back in time.