EVR-1001 Lecture Notes - Lecture 5: Titus Salt, Exponential Growth, Doubling Time
6 Oct 2016
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Document Summary
A population increasing by a constant percentage per unit time. 1965-1970 with rapid improvement of healthcare and food production. Now human population growth is at 1. 2% Slowing in wealthy industrialized nations but still increasing in many less-developed nations. Improvements in health and food security led to rapid increase in pop. Built in 1851 by sir titus salt. Time required for a population to double in size. Calculated by dividing annual growth rate (%) into 70 (rule of 70) It changes quickly as growth rate changes. Us with a growth rate of . 6% = x2 in 117 years. Nicaragua with a growth rate of 2. 7% = x2 in 26 years. Northern europe with a growth rate of . 2% =x2 in 350 years. Global population is increasing at a rate of 1-2% per year and so it will double over the next 35-70 years. Growth increases exponentially only temporarily to the inflection point.
