GEOS 24705/ ENST 25500 U. Chicago Mar 2011 Lecture...
Transcript of GEOS 24705/ ENST 25500 U. Chicago Mar 2011 Lecture...
GEOS 24705/ ENST 25500 U. Chicago Mar 2011
Lecture 2 Earth’s energy flows II
Where to get practice in estimation / approximation?
Where to get practice in estimation / approximation?
Los Angeles (34 N)
Portland (44 N)
Anchorage (61 N)
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