sustain_lecture_slides_1-2 sustainability and population growth
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Sustain_lecture_slides_1-2 Sustainability and Population GrowthTRANSCRIPT
Sustainability & Population Growth
World Population
IPAT Equation
I = P x A x T
Impact
Population
Affluence
Technology
Sustainability Impact Equation
SI = P x C/P x I/C
Sustainability Impact
Population
Consumption per capita
Impact per consumption
Sustainability Impact Equation: Double Population
2SI = 2P x C/P x I/C
Sustainability Impact
Population
Consumption per capita
Impact per consumption
Sustainability Impact Equation: Double Consumption per Person
2SI = P x 2C/P x I/C
Sustainability Impact
Population
Consumption per capita
Impact per consumption
Sustainability Impact Equation: Lowering Impact per Consumption
½ SI = P x C/P x I/2C
Sustainability Impact
Population
Consumption per capita
Impact per consumption
Manhattan Limitation of IPAT
IPAT Terms are Co-dependent
I = P(A,T) × A(P,T) × T(A,P) Impact
Population Affluence
Technology
For the math geeks…
Human Experience Other Factors: Human Experience
Health and Wealth Other Factors: GDP
As GDP per person increases (x-axis) so does life expectancy (y-axis). Note that Japan, the country with highest life-expectancy, has a very high GDP per person
Happiness and Affluence
As GDP per person increases (x-axis) so does self-reported life satisfaction (y-axis) Note that the happiest country – Denmark – also has a very high GDP per person.
Not All Consumption is Equal
References • Schwen, Daniel. 2005. “NYC wideangle south from Top of the Rock.” Wikimedia Commons. http://en.wikipedia.org/wiki/File:NYC_wideangle_south_from_Top_of_the_Rock.jpg
• Tompkin, Jonathan. 2012. “Too-rigorous application of IPAT style thinking discounts the human experience.”
• Rosling, Hans. 2011. “Gapminder World Chart 2010 Version May 2010b.” Gapminder. http://www.gapminder.org/GapminderMedia/wp-uploads/pdf_charts/GWC2010.pdf
• Heston, Alan; Summers, Robert; and Aten, Bettina. 2006. “Penn World Table Version 6.2.” Center for International Comparisons of Production, Income and Prices at the University of Pennsylvania. http://pwt.econ.upenn.edu/php_site/pwt62/pwt62_form.php
• Theis, Tom and Jonathan Tomkin, editors. Sustainability: A Comprehensive Foundation. http://cnx.org/content/col11325/latest/