Energy and sustainability
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Energy and Sustainability. Energy. How much energy do you need? How much energy do you use?. How much energy do you need? Energy from food = 2,000 Calories / day = 8,000 BTUs / day Energy for all of the other things you do = (Take a guess) _____________ BTUs ?. Energy.

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Energy and Sustainability

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Energy and sustainability

EnergyandSustainability


Energy

Energy

How much energy do you need?

How much energy do you use?


Energy1

  • How much energy do you need?

  • Energy from food

    • = 2,000 Calories / day

    • = 8,000 BTUs / day

  • Energy forall of the other things you do

    • = (Take a guess) _____________ BTUs ?

Energy


How much

Total annual energy consumption in the United States (2011)

97.3 quadrillion BTUs

~ 1017 BTUs

~ 1020 Joules

(1 BTU = 1055 Joules)

How much?


How much1

Total U.S. energy consumption

= 97 x 1015 BTUs / year

Then yourenergy consumption / day is

97 x 1015 BTUs / year

(316,000,000 people) (365 days / year)

= 840,000BTUs / person / day

( + 8,000 BTUs from food )

How much?


How much2

So, if you are a typical U.S. resident, you will use about 848,000 BTUs of energy today

Food:

8,000 BTUs

For all other things:

840,000 BTUs

How can this be?

How much?


U s energy uses

Sector

Electric Power40%

Transportation 28%

Industry21%

Res & Commercial 11%

Total (97 quads)100%

U.S. Energy Uses

Your energy use = Direct use + Indirect use


U s energy sources

U.S. Energy Sources


U s renewable energy

Source (quads)

Hydroelectric 3.2

Wood2.0

Biofuels1.9

Wind1.2

Waste0.5

Geothermal0.2

Solar / PV 0.2

Total (quads) 9.1

U.S. Renewable Energy

Renewables are ~ 9% of U.S. Total Energy Consumed


World energy consumption

World Energy Consumption

Oil35%

Natural Gas24%

Coal28%

Nuclear6%

Hydro6%

Renewable2%

Total510 quads

= 200,000 BTUs / person / day


Personal consumption

Personal Consumption

BTUs / person / day

United States840,000

Australia718,000

France498,000

Japan440,000

Mexico157,000

China130,000

Brazil84,000

India36,000

Parts of Africa7,000


Population

Population


Population1

Population


How much energy do we have left

How much energy do we have left?


Energy reserves

Energy Reserves

Estimated world reserves of fossil fuels

(in quadrillion BTUs):

Years left

Quadsat current

consumedconsumption

Reserves per year rate

Oil6,37017836

Natural gas6,39012153

Coal20,250143142


Are there any other problems

Are there any other problems?


The carbon problem

The Carbon Problem

Fuels:

Oil35%

Natural Gas24%87%

Coal28%

Nuclear6%

Hydro6%

Renewable2%

510 Quadrillion BTUs / year


The carbon problem1

The Carbon Problem


The carbon problem2

The Carbon Problem


Green strategies

  • Conservation

  • Efficiency

  • Geothermal

  • Solar

    • Passive

    • Photovoltaic

  • Fuel cells

  • Tidal

  • Wind

  • Waves

  • Hydroelectric

  • Nuclear

  • Biomass

Green Strategies


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