19.3: HUMAN POPULATION GROWTH

By the end of this class 20,000 babies will have been born. What has caused this rapid growth? How long can this continue?

HISTORY OF HUMAN POPULATION Hunter-gatherer Lifestyle (500,000 years ago to 12,000 years ago) Small nomadic groups Slow growth rate

HISTORY OF HUMAN POPULATION The population explosion Grew due to decline in death Increased sanitation and hygiene Increased food supply and economics

POPULATION GROWTH TODAY 20% of world’s population lives in developed countries (modern, industrialized) Growth rate is very low (.003 per capita)

POPULATION GROWTH TODAY 20% of world’s population lives in developed countries (modern, industrialized) Growth rate is very low (.003 per capita) 80% of population live in developing countries High growth rate (.015 per capita)

VIDEO ulationgrowth/

DEMOGRAPHIC TRANSITION Model showing how population can stop growing Stage I: birth and death rate at high levels and population size is stable

DEMOGRAPHIC TRANSITION Stage 2: population explosion occurs. Death rates decline as hygiene, nutrition, and education increase, but birth rates remain high.

DEMOGRAPHIC TRANSITION Stage 3: Birth rates decrease coming close to death rates which stabilizes population size.

DEMOGRAPHIC TRANSITION Stage 4: birth rate drops below death rate so population size decreases.

CLASS WORK Human Growth WS Eco Vocab Homework