Geography 2143A/B : Geography 2143A (Part 4) October 25.docx

• School: Western University
• Department: Geography
• Course: Geography 2143A/B
• Professor: Milford Green

Document Summary

Doubling time how long does it take for country"s population to double in size? if a country"s population continues to grow at a constant rate of 2 percept, it will double in size every 35 years is calculated by 70 (% growth) = # of years to double: 70 never changes: it"s part of the formula ex: if a country has a 2 percent growth rate, it will take 35 years to double in population, 70 2 = 35, there will be a question about this on quiz 4 no calculators allowed! Medical improvements did not have an impact on death rates until after world war ii rather, death rate decreases were due to agricultural improvements less starvation his assumption was that: population grew geometrically: 1 (cid:224) 2 (cid:224) 4 (cid:224) 8 (cid:224) 16, food supply grew arithmetically: 1 (cid:224) 2 (cid:224) 3 (cid:224) 4 (cid:224) 5, not a sustainable system!