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In this module, the following topics are presented: 1) an outline of the history of human energy use, 2) challenges to continued reliance on fossil energy, and 3) motivations and time scale for transitions in energy use.

Learning objectives

After reading this module, students should be able to

  • outline the history of human energy use
  • understand the challenges to continued reliance on fossil energy
  • understand the motivations and time scale for transitions in energy use

Introduction and history

Energy is a pervasive human need, as basic as food or shelter to human existence. World energy use has grown dramatically since the rise of civilization lured humans from their long hunter-gatherer existence to more energy intensive lifestyles in settlements. Energy use has progressed from providing only basic individual needs such as cooking and heating to satisfying our needs for permanent housing, farming and animal husbandry, transportation, and ultimately manufacturing, city-building, entertainment, information processing and communication. Our present lifestyle is enabled by readily available inexpensive fossil energy, concentrated by nature over tens or hundreds of millions of years into convenient, high energy density deposits of fossil fuels    that are easily recovered from mines or wells in the earth's crust.

Sustainability challenges

Eighty five percent of world energy is supplied by combustion of fossil fuels. The use of these fuels (coal since the middle ages for heating; and coal, oil and gas since the Industrial Revolution for mechanical energy) grew naturally from their high energy density, abundance and low cost. For approximately 200 years following the Industrial Revolution, these energy sources fueled enormous advances in quality of life and economic growth. Beginning in the mid-20th Century, however, fundamental challenges began to emerge suggesting that the happy state of fossil energy use could not last forever.

Environmental pollution

The first sustainability challenge to be addressed was environmental pollution, long noticed in industrial regions but often ignored. Developed countries passed legislation limiting the pollutants that could be emitted, and gradually over a period of more than two decades air and water quality improved until many of the most visible and harmful effects were no longer evident.

Limited energy resources

The second sustainability issue to be addressed has been limited energy resources. The earth and its fossil resources are finite, a simple fact with the obvious implication that we cannot continue using fossil fuels indefinitely. The question is not when the resources will run out, rather when they will become too expensive or technically challenging to extract. Resources are distributed throughout the earth's crust – some easily accessible, others buried in remote locations or under impenetrable barriers. There are oil and gas deposits in the Arctic, for example, that have not been explored or documented, because until recently they were buried under heavy covers of ice on land and sea. We recover the easy and inexpensive resources first, leaving the difficult ones for future development. The cost-benefit balance is usually framed in terms of peaking – when will production reach a peak and thereafter decline, failing to satisfy rising demand, and thus create shortages? Peaks in energy production are notoriously hard to predict because rising prices, in response to rising demand and the fear of shortages, provide increasing financial resources to develop more expensive and technically challenging production opportunities.

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Sustainability: a comprehensive foundation. OpenStax CNX. Nov 11, 2013 Download for free at http://legacy.cnx.org/content/col11325/1.43
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