geos 24705/ enst 25500 u. chicago mar 2011 lecture...
TRANSCRIPT
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GEOS 24705/ ENST 25500 U. Chicago Mar 2011
Lecture 2 Earth’s energy flows II
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Where to get practice in estimation / approximation?
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Where to get practice in estimation / approximation?
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Los Angeles (34 N)
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Portland (44 N)
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Anchorage (61 N)
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Agenda for this lecture Build up to calcula,ng whether hydro and biofuels
can power the modern world
• Sunlight and IR radia/on (why "it all ends up as heat" isn't quite right)
• Efficiency – defini/ons
• Energy flow #1: hydrological cycle efficiency
• Pre-‐industrial human energy needs
(energy to sustain life)
• Energy flow #2: photosynthesis efficiency
• Modern energy use and change from preindustrial
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