History of energy use first look at history of temperature of the earth
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History of Energy use, First look at history of temperature of the earth. demos. C8-31 measure human work. How did we get here?. A typical person can do work at a rate of about 100 Watts (J/s) Humans “burn” energy at a rate of about 1.6x10 13 Watts.

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History of energy use first look at history of temperature of the earth

History of Energy use, First look at history of temperature of the earth

PHYS105: Physics for Decision Makers, Eno, F14


Demos

demos

  • C8-31 measure human work

PHYS105: Physics for Decision Makers, Eno, F14


How did we get here

How did we get here?

A typical person can do work at a rate of about 100 Watts (J/s)

Humans “burn” energy at a rate of about 1.6x1013 Watts.

World population is about 6x109 people.

The US “burns” energy at a rate of 3.3x1012 Watts.

The US population is 3.2x108 people.

PHYS105: Physics for Decision Makers, Eno, F14


How did we get here1

How did we get here?

http://www.eia.gov/energyexplained/

PHYS105: Physics for Decision Makers, Eno, F14


History of energy use

History of Energy Use

100 W =3.6x103kcal/day

Adapted from E. Cook, “The Flow of Energy in an Industrial Society”, Sci. Amer. 224, p. 136, 1971.

PHYS105: Physics for Decision Makers, Eno, F14


Population growth

Population Growth

fire

industrial

horse

water

PHYS105: Physics for Decision Makers, Eno, F14


A person power

A person-power

Demonstration of a person power (c8-13)

A person is capable of generating roughly 100 W.

Memorize this number.

A typical American uses, on average, 100 person-powers, of energy.

The US in total uses 30,000,000 person-power/ year.

PHYS105: Physics for Decision Makers, Eno, F14


Burning wood peat etc

Burning Wood, Peat, etc

prometheus

PHYS105: Physics for Decision Makers, Eno, F14


Agriculture

Agriculture

  • Large growth in human population

Mycene, 1600 bc

PHYS105: Physics for Decision Makers, Eno, F14


Wind water

Wind/Water

  • Whale oil

  • Coal

  • Steam engine

  • Irrigation via gravity

  • Wind/water

  • Destruction of European medieval forests 1100-1500

PHYS105: Physics for Decision Makers, Eno, F14


Industrial era

Industrial Era

  • Large scale air pollution due to coal burning

Widnes, England, late 1800s

PHYS105: Physics for Decision Makers, Eno, F14


Modern era trends

Modern Era: Trends

115 people powers/ person

U.S. Energy Consumption by Source

Invention of steam engine

PHYS105: Physics for Decision Makers, Eno, F14


History of energy use first look at history of temperature of the earth

PHYS105: Physics for Decision Makers, Eno, F14


History of earth s temperature

History of earth’s temperature

"All palaeotemps" by Glen Fergus - Own work. Licensed under Creative Commons Attribution-Share Alike 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:All_palaeotemps.svg#mediaviewer/File:All_palaeotemps.svg

humans

Land animals

Extinction of dinosaurs, formation of Chesapeake Bay

Notice the total range is about 20 degrees C ( 36 degrees F)

But think how the environment has changed over that range of temperatures, from swamp of the Eocene age 66 million years ago, when there were forests in the artic and Antarctic, to ice age.

PHYS105: Physics for Decision Makers, Eno, F14


What you should know

What you should know

  • Know the 6 approximate technological stages for energy use and the approximate year they happened. Know approximately the ratio of power used per person compared to the power an unassisted person can generate for each era.

  • Know some environmental problems that occurred during eras prior to the current one.

  • Know approximately the total range of temperatures seem from 500 million years ago until the present.

PHYS105: Physics for Decision Makers, Eno, F14


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