EnergyEnergy

Humans use varied energy resourcesHumans use varied energy resources Most came from solar energyMost came from solar energy Decomposition of plants, animals buried Decomposition of plants, animals buried

underground form underground form fossil fuelsfossil fuels

Which are non-renewable?

How fossil fuels are formedHow fossil fuels are formed

1. Plants and animals collect in layers of mud in 1. Plants and animals collect in layers of mud in a shallow seaa shallow sea

2. Layer is buried, heated, pressurized2. Layer is buried, heated, pressurized 3. Rock is bent, oil is trapped with natural gas 3. Rock is bent, oil is trapped with natural gas

above and water belowabove and water below

global global energy energy sourcessources

Fossils fuels are Fossils fuels are non-renewablenon-renewable 88% is from fossil sources88% is from fossil sources Burning creates COBurning creates CO22

Fossil fuels will someday Fossil fuels will someday run outrun out

Past and future energy use

Which countries consume the most energy?

Alternative energy Alternative energy sourcessources

SolarSolar WindWind GeothermalGeothermal NuclearNuclear TidalTidal HydroelectricHydroelectric BiofuelBiofuel

We are searching for We are searching for other sources of energyother sources of energy

Renewable resourcesRenewable resources will not run outwill not run out

Environmental impacts Environmental impacts could be much lesscould be much less

Desert areas have potential for solar, geothermal power

Coastal areas for wind generation and tidal power

Renewable energy sources

Hydro-Hydro-electricelectric Moving water Moving water

turns turbines to turns turbines to generate generate electricityelectricity

Most rivers are Most rivers are already dammedalready dammed

Causes problems Causes problems for fish, for fish, downstream downstream habitatshabitats

Reducing energy wasteReducing energy waste

All forms of energy All forms of energy generation waste generation waste energyenergy

Power plants are Power plants are only 35% efficientonly 35% efficient

We need to reduce We need to reduce our energy use our energy use andand energy wasteenergy waste

157 mpg car

Review Review 1.1. Where does most energy for life come Where does most energy for life come

from?from?

2.2. Is oil a renewable resource?Is oil a renewable resource?

3.3. How much energy does the US use How much energy does the US use compared to the world average?compared to the world average?