20-3 Human Population Growth Explain how the development of agriculture changed the pattern of human growth Describe the change in human population growth that began around 1650 Describe how growth rates have changed since WWII Compare the general standard of living in developed countries with developing countries

Urban sprawl shows dramatic increases in sprawl especially in the East. Hydrologic regions in red had at least 50,000 acres converted to 'developed' between 1992 and 1997

History of Human Population Growth 500,000 BCE -10,000 BCE Humans were nomads & hunter/gatherers Roamed around, followed herds, gathered fruit growing naturally No farms Agricultural revolution: Humans start farming Life was safer People survived Population went up 10,000 BCE there were 2 million people Allegheny county 3 years ago had a population of around 1,200,000 Map showing where the indian tribes where located

Population explosion 1650 CE there is a sharp decline in death rates Sanitation More food availabe Disease controlled Birth rates stayed high After WWII technological improvements led more population increase

Different colors show different biomes

Four stages during which a society becomes modernized and developed.