Global Issue Presentations 20132014 What is the overpopulation issue Man begets but land does not beget Cecil Rhodes Increasing population Decreasing resources Population density Population is higher than the carrying capacity ID: 580921
Download Presentation The PPT/PDF document "Overpopulation" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Overpopulation
Global Issue Presentations 2013-2014Slide2
What is the overpopulation issue?
“Man begets, but land does not beget”-Cecil Rhodes
Increasing population
Decreasing resourcesPopulation densityPopulation is higher than the carrying capacity
What is overpopulation?Slide3
The world population is increasing along with the average life expectancy.
Life Expectancy76 – 2045-205082 – 2095-210089 – 2100 in developed nations
(World Population Prospects: the 2012 Revision)
United Nations
The IssueSlide4
7 billion – October 31
st 2011 (United Nations)
Growth rate:Worldometers – 1.1%
CIA World Factbook (2012) – 1.095%
+80 million per year
Growth rate peak – 2.19% in 1963
StatisticsSlide5
StatisticsSlide6
1 billion – 1804
2 billion – 19273 billion – 19604 billion – 1974
5 billion – 19876 billion – 19997 billion – 2011
Previous milestones Slide7
Sigmoid Population GrowthSlide8
Human Population Growth
Source:
Worldometers.infoSlide9
+1 billion in the next 12 years
8.1 billion – 20259.6 billion – 2050Developing regions5.9 billion – 8.2 billion (2013-2050)
China and India: 1.45 billion (2028)50% of population growth: AfricaStabilize at 10 billion - 2062
Predictions (United Nations)Slide10
Carrying capacity – 10 billion (2062)
+75 – 80 million per yearCurrent population 7 billion
75,000,000/7,000,000,000 = 0.0107 x 100 = 1.07%80,000,000/7,000,000,000 = 0.0114 x 100 = 1.14%
MathematicsSlide11
Future Population = N=N
0ekt
Time =
Rate =
Exponential Growth and DecaySlide12
l
n = natural logarithm: log to the base
ee = an irrational number (2.7182818…) (Euler)
t = time
k or r = growth rate (births – deaths)N =
future population
N
0
=
initial population
Variables ExplainedSlide13
Finding the time that the population will reach 10 billion (carrying capacity).
Calculations
10=7
e
(0.011)(t)
1.429=e
(0.011)(t)
ln
(1.429)=
ln
(e
(0.011)(t
)
)
ln
(1.429)=0.011
t
ln
(
1.429)/0.011 =
t
t
≈ 32.452
Property of Logarithms:
l
n
(e
x
) = xSlide14
Future population =
N=N0e
kt10 = 7e(0.011)(32.452)
= 10.003
Verifying Calculations
Future population (billions)
Current population (billions)
Growth rate
Time (from previous calculation)Slide15
UN – 2062-2013 = 49 years
N=N
0ekt
7e(0.011)
(49) =12 billion
ln
(10/7)/49=0.00727
If the population will reach 10 billion in 49 years, the average growth per year will be 0.7%
UN Estimates