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19.1 Energy Resources and Uses
Most of the world's energy comes from fossil fuels.
The U.S. uses the most energy for transportation.
The world is consuming more energy.
1 kilowatt-hour (kWh) is the amount of electricity needed for 1 hour, and many of the questions in environmental science have a link to energy resources.
Dramatic transitions have taken place in energy use.
The first external energy source used by humans was probably Fire 1 PJ.
1 million years ago, sites were occupied by our ancestors.
Since the dawn of the Neolithic 1 metric ton of standard coal has been an important source of muscle power for animals.
Water and wind power have been used for a long time.
In the United States, a typical power plant can provide up to 1,000 megawatts of cooking and heating.
For the mid-nineteenth century, this is enough.
The invention of the steam engine caused 640,000 U.S. households to switch to Europe.
Coal is the major energy source during the Industrial Revolution.
In the twentieth century, oil replaced Coal as the primary fuel for wind turbine production, so it takes a lot of Coal to make one conventional power plant.
It is due to the ease of shipping and burning liquid fuels.
The opening case study for this chapter shows that a lot of coal mines and oil fields are needed to supply fuel to a power plant.
The end of coal is typically produced by commercial-scale solar plants.
It is easy to acces around 150 to 500 MW of electricity.
The British thermal unit (Btu), the amount of oil we have become dependent on, is used by the energy industry in the United States.
42 gallons is equivalent to one barrel.
Natural gas, which is a gas like air, not liquid like gasoline, is the cost of propping up regimes.
Coal and oil have been high.
We expected to decline in the next few decades.
Analysts warn that we have far more coal, oil, and natural gas than we can safely use and that oil supplies in the past were about running out of fossil fuels.
The remaining fossil fuels are in the ground.
Averages are shown, but actual rates vary a lot.
Final PDF to printer "New" technologies are mostly sustainable, but they have a long way to go to replace fossil fuels.
Peaking of energy sources.
About 88 percent of commercial energy is supplied by fossil fuels.
Most of the trans portation energy is used by motor vehicles.
35 percent of our current supply is passenger miles and natural gas, while 25 percent is freight and 20 percent is coal.
About 75 percent of all freight traffic in the United States is carried by trains, barges, ships, and pipelines, but 10 percent of our power is provided by nuclear reactor.
Transport fuel is the most rapidly growing energy sector.
The British thermal units are called units.
The line width is determined by the amount of energy.
55.6% of energy production is lost through inefficiency and leakage.
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