Human Population : Human Population : AP Environmental Science October 2012.

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Human Population : Human Population : AP Environmental Science October 2012

Human Population Growth Historically A. Early Hunter Gatherers 1. Nomadic, With a Strong Sense of the Earth B. Rise of Agriculture 1. Necessary for Survival a. Animals became extinct via predation and altered habitat b. Humans began to cultivate own food

C. Agriculture Gives Rise to Cities 1. Food Produced in Country, Consumed in City a. Food wastes are no longer returned to soil b. Soil becomes less productive 2. Waste of Populations Concentrated in Cities 3. Population Control in Medieval Societies a. Infanticide b. Plagues

D. Industrialization 1. View of Children During Early Phases of Industrial Growth a. Valued as cheap source of income and cheap labor b. Exponential growth of populations 2. By 1900s, Birth Rate in Industrialized World Dropped a. Rise in standards of living b. Safe and inexpensive means of birth control introduced c. Increase in the cost of child rearing

MILLIONSMILLIONS

Over 95% of this increase will take place in “Developing Countries” Population Projections

How Much is a Billion? 1,000 seconds = 16.7 minutes 1 million-s = 16,677 min = 11.6 days 1 billion-s = 11,574 days = 31.7 years 1,000 pennies = ~ 88 ounces = 5.5 pounds 1 million pennies = 5,500 pounds (~1-Suburban) 1 billion pennies = 2,750 tons (~2 Space Shuttles)