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Current Human Population Growth and Implications

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Presentation on theme: "Current Human Population Growth and Implications"— Presentation transcript:

1 Current Human Population Growth and Implications

2 Human Population History

3 Factors Contributing to Population Explosion
Agricultural advances Advances in medicine Industrial revolution

4 Reasons for exponential growth of human population
Increased food supply Improvements in medical and public health and technology Improvements in sanitation and personal hygiene Safer water supplies

5 Thomas Malthus Studied the decline of living conditions in 19th century England Blamed this decline on: Too many children Inability of resources to replenish at levels with increased population Irresponsibility of lower class Proposed regulating family size of lower class to limit it to a level they could support

6 Malthus continued He said “positive checks” like food shortages and disease kept population at appropriate levels He said population growth was exponential but food production could not keep growing exponentially. As of today, he was wrong due to GM foods.

7 Current Stats World Population: 6.6 billion people
U.S. Population: 295 million people Kentucky Population: 4.1 million people Louisville Population: 500,000 people The U.S. is only 5% of the world’s population, but we use ~ 1/3 of the Earth’s natural resources!!!

8 Crude Birth Rate and CDR
CBR= the number of live births per 1000 members of the population in one year. CDR= the number of deaths per 1000 members of the population in one year. When calculating population change you must take into account total population size when using CDR and CBR.

9 Population change= (CBR+ immigration) – (CDR + emigration)
Example: If the population is 50,000 and the number of births is 14 per 1000 and the number of deaths is 5 per 1000, what was the population change assuming no net immigration or emigration?

10 Alarming Facts… The human population is currently growing at a rate of 260,000 people per day! Every 3 years, the global environment must support another 285 million people

11 As a result of rapid growth…
1.3 billion people are impoverished 841 million people are chronically malnourished Supplies of water for irrigation are declining Nearly half of the Earth’s land mass has been changed by human activity Ocean fish stocks are depleting Species are going extinct faster than ever

12 Earth’s Carrying Capacity (2billion-30billion)
Determined by Food production Living space Waste assimilation Resource availability Can be expanded through advances in Agriculture Industry Medicine

13 Accomodations To accommodate greater populations, many policies would have to be implimented: Massive recycling Driving restrictions Restrictions on the transport of food Prohibitions against cutting trees on one’s property Limitations to burning of fossil fuels

14 Fertility rates Replacement level fertility (RLF)= having enough kids to replace yourself Slightly higher than 2 (2.1) b/c some kids die Total fertility rate (TFR)= average number of children a woman will have in her lifetime Many factors affect like urbanization, education, contraceptives and abortion availability

15 Indicators of overall human health:
Life expectancy Infant mortality rate

16 Other factors that affect population growth
Policies to encourage immigration Environmental refugees Religious persecution Baby boom generation in US Why they are waiting to retire How their retirement will affect the rest of us

17 Demographic Transition
Pre-industrial= little to no growth (African nations) Transitional= rapid growth (Mexico, Pakistan) Industrial= stable growth (china) Post-industrial= declining growth (Japan, Russia, Germany)

18 Why are developing countries like India not moving toward Industrial stage?
Most people are poor. Money is kept to few in the country.

19 Age Structures and what they tell us about future population growth:
What would a stable population age structure look like? What would a declining population age structure look like?

20 Ways to lower population growth:
Provide economic incentives for having fewer children Empower and educate women More education means more money for work which mean less children are needed to take care of parents More education usually means having children later in life which usually means having less children

21 Cont. Family planning including contraceptives, legal abortions
Improve prenatal and infant health care (need less kids if they survive)

22 China and India as case studies on family planning
What do you think of these interventions?

23 What do you think? What is the US’s role (thus the taxpayers role) in other country’s population control?

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