# Energy and Sustainability - PowerPoint PPT Presentation

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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

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

Total annual energy consumption in the United States (2011)

~ 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?

Sector

Electric Power40%

Transportation 28%

Industry21%

Res & Commercial 11%

### U.S. Energy Uses

Your energy use = Direct use + Indirect use

### U.S. Energy Sources

Hydroelectric 3.2

Wood2.0

Biofuels1.9

Wind1.2

Waste0.5

Geothermal0.2

Solar / PV 0.2

### U.S. Renewable Energy

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

### World Energy Consumption

Oil35%

Natural Gas24%

Coal28%

Nuclear6%

Hydro6%

Renewable2%

= 200,000 BTUs / person / day

### 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

### Energy Reserves

Estimated world reserves of fossil fuels

Years left

consumedconsumption

Reserves per year rate

Oil6,37017836

Natural gas6,39012153

Coal20,250143142

### The Carbon Problem

Fuels:

Oil35%

Natural Gas24%87%

Coal28%

Nuclear6%

Hydro6%

Renewable2%

### The Carbon Problem

• Conservation

• Efficiency

• Geothermal

• Solar

• Passive

• Photovoltaic

• Fuel cells

• Tidal

• Wind

• Waves

• Hydroelectric

• Nuclear

• Biomass