ENERGY MYTHS AND REALITIES · 2013-01-16 · ENERGY MYTHS AND REALITIES Vaclav Smil Year Population...
Transcript of ENERGY MYTHS AND REALITIES · 2013-01-16 · ENERGY MYTHS AND REALITIES Vaclav Smil Year Population...
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ENERGY MYTHS AND REALITIES �Vaclav Smil
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Year Population Energy use Economic product Life Global phytomass (million) (GJ/capita) (2000$/capita) expectancy stock (Gt C)
5000 bp 20 < 3 < 100 20 >1,000 0 200 < 5 500 < 25 1,000 1000 300 < 10 500 < 30 900
1801 900 23 600 35 750 1900 1,600 27 1,200 40 660 2000 6,100 75 6,500 67 600 2010 6,900 75 7,500 69 <600
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GGRAIN:STRAW
Traditional cereals had G:S ratio 0.25:1. Joachim Patinir’s 1514 Rest on the flight to Egypt (in Prado) illustrates that reality. Grain yield just 0.5-1 t/ha.�
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Modern short-stalked wheat just before harvesting G:S ratio 1:1, grain yield 4-8 t/ha�
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Energy use and subjective well-being http://www.thehappinessshow.com/HappiestCountries.htm
LLevel of subjective well-being • 1. Puerto Rico • 2. Mexico • 3. Denmark • 4. Colombia
• 10. Canada • 13. Venezuela • 15. USA • 33. Spain • 39. Japan
Average annual energy use in 2010 (GJ/capita)
100 70 160 35
390 110 345 130
170