human energy use do now: define: energy where does most of the energy used by humans come from?
Post on 20-Dec-2015
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Human Energy Use
Do Now:
Define: Energy
Where does most of the energy used by humans come from?
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Energy
• Physics: The ability to do work (=Fd)
• General: The ability to cause change.
• Units: Joule (SI) Calorie (English) kCal (dietary calorie
• Laws of thermodynamics:– 1: Energy cannot be created or destroyed– 2: No transformation of energy is 100%
effiicient (entropy increases in a closed system)
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Human Energy
• 80-90% of the energy used by Homo sapiens is produced by the combustion (oxidation) of fossil fuels…
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It all started waaaaaay back…
The energy stored in the fossil fuel we use today was first captured by plants millions of years ago.
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Geology Takes a Turn
Coal formationOil & gas accumulation
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Getting it out of the ground
Offshore oil rig
Open pit coal mine
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Crude Oil is Organic Chemicals
There’s thousands of different chemicals in oil that comes out of the ground.
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The different parts or
“fractions” must be
separated before
they’re used
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Oil Refinery
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What about coal?
The combustion of coal produces more CO2 than equal amounts of any other fossil fuel
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Most Coal is Used to Produce
Electricity
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What Homo sapiens Use Energy To Do
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Consequences
Humans have consumed more crude oil than they have discovered for over 20 years now.
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Metabolism with Global Consequences
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Human Population Growth
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The Effect of Resource Depletion and Toxin
Accumulation on a Population
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What to do?We must begin using less energy – whether
we want to or not.
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Life on Earth has relied on the sun’s light as it’s primary energy source for
billions of years.
Solar Panels: 2 designs
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Our technology is what truly makes our species unique on Earth. Use the best brain and hands that evolution has ever produced to make a difference.