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# Energy and Sustainability - PowerPoint PPT Presentation

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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Presentation Transcript
EnergyandSustainability

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 forall of the other things you do

• = (Take a guess) _____________ BTUs ?

Energy

~ 1017 BTUs

~ 1020 Joules

(1 BTU = 1055 Joules)

How much?

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?

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?

Electric Power 40%

Transportation 28%

Industry 21%

Res & Commercial 11%

U.S. Energy Uses

Your energy use = Direct use + Indirect use

Hydroelectric 3.2

Wood 2.0

Biofuels 1.9

Wind 1.2

Waste 0.5

Geothermal 0.2

Solar / PV 0.2

U.S. Renewable Energy

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

Oil 35%

Natural Gas 24%

Coal 28%

Nuclear 6%

Hydro 6%

Renewable 2%

= 200,000 BTUs / person / day

BTUs / person / day

United States 840,000

Australia 718,000

France 498,000

Japan 440,000

Mexico 157,000

China 130,000

Brazil 84,000

India 36,000

Parts of Africa 7,000

Estimated world reserves of fossil fuels

Years left

consumed consumption

Reserves per year rate

Oil6,370 178 36

Natural gas 6,390 121 53

Coal 20,250 143 142

Fuels:

Oil 35%

Natural Gas 24% 87%

Coal 28%

Nuclear 6%

Hydro 6%

Renewable 2%

• Conservation

• Efficiency

• Geothermal

• Solar

• Passive

• Photovoltaic

• Fuel cells

• Tidal

• Wind

• Waves

• Hydroelectric

• Nuclear

• Biomass

Green Strategies