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Energy

Mardi 15 février 2005

 Will fossil fuels ever run out ?

 

 

 

Hello, everybody,

 

Today, I choose to focus on a tricky issue : the potential declining of fossil-fuel ressources since the world oil markets have risen the price of gas and petrol very lately.

 

I think that world oil supplies may deplete for the years to come if the demand exceeds the offer from the Middle East countries, Russia and South America.

Plus, oil is used in many industries, from factories of pesticides to plastic essential to the package of consumer goods. In fact, for many areas, leading industrial countries are depending on oil, not only for transportation but also for agriculture and medicine for example.

 

The problem is that fossil fuels are not renewable. New oil resources are scarce and oil companies have to cough up a lot of money to explore new wells. Moreover, globally speaking, experts have little information about reserves.

 

So, if higher energy costs and scarcity of resources may occur in the future, we have to consider again our growth models based to the increase of the GDP. Now, we have to take into account some new notions such as sustainable growth.

 

Indeed, there is a growing concern about the environmental impact of hydrocarbons with the rise of CO2 emissions so that the most industrialised countries are more prone to use alternative energy sources, but there's a long way to go.

 

In an next article, I will try to stress the importance of nuclear power as a source of energy.

 

See you later,

 

Scorpio

 

 

Par Fran Scorpio
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Mardi 28 juin 2005

France chosen as site for nuclear reactor

 

By VLADIMIR ISACHENKOV ASSOCIATED PRESS WRITER

 

PARIS -- France was chosen Tuesday as the home for an experimental $13 billion nuclear fusion project scientists say will produce a boundless source of clean and cheap energy.

 

A consortium of United States, the European Union, China, Russia, Japan had been divided over whether to put the test reactor in France or Japan, and competition was intense. The U.S. had favored placing the plant in Japan. At stake was billions of dollars for research, construction and engineering.

 

The threat of global warming has brought nuclear power - currently available only through fission and long out of favor - back to the forefront as a way of generating energy because it creates no so-called greenhouse gases, a cause of global warming.

 

Nuclear fission - with heat as a byproduct - occurs when heavy atoms such as those of uranium or plutonium are split. But the process leaves behind highly radioactive waste, and the reactors can catastrophically melt down.

 

Harnessing fusion as an energy source has long been a dream of physicists because it would be safer, cleaner and cheaper - using naturally abundant hydrogen as an energy source.

 

The major source of energy right now, the burning of fossil fuels such as coal and oil, spews greenhouse gases into the Earth's atmosphere and trap the sun's heat. Oil supplies are expected to begin running short in about 50 years.

 

As a replacement, fusion would produce much more energy than fission, while leaving behind small amounts of relatively harmless waste and posing no danger of a nuclear meltdown.

 

France's Greens and other environmentalist groups argue, however, that the fusion project will turn the focus away from the immediate need to fight global warming.

 

"This is not good news for the fight against the greenhouse effect, because we're going to put $13 billion toward a project that has a term of 30-50 years, when we're not even sure it will be effective," Greens party lawmaker Noel Mamere said on France-Info radio.

 

But State Department spokesman Tom Casey said the United States was pleased the sides had agreed on a site. "Now the six partners will work together to resolve the other various technical and legal questions that exist so we can move forward on this critically important energy experiment," he said.

 

Participants will now negotiate the construction details and sign a final agreement, hopefully by year's end.

The project is expected to create 10,000 jobs and take about eight years to build.

 

But fulfilling the long-term vision of the International Thermonuclear Experimental Reactor, as it is called, could take decades.

 

Cadarache, in the southern region of Provence, was chosen during talks in Moscow after Japan, which had sought the project, reportedly backed down, agreeing instead to a bigger role in research and operations.

 

If all goes well with the experimental reactor, officials hope to set up a demonstration power plant in Cadarache around 2040. Officials project that as much as 20 percent of the world's energy could come from fusion by the century's end, said Raymond L. Orbach, the U.S. Department of Energy's office of science director.

 

President Jacques Chirac called the decision "a great success for France, for Europe and for all of the partners" in the project.

 

"The international community will now be able to take on an unprecedented scientific and technological challenge, which opens great hopes for providing humanity with an energy that has no impact on the environment and is practically inexhaustible," he said.

Russia, China and the European Union wanted to locate the plant at Cadarache, in southern France.

 

The EU argued that Cadarache, one of the biggest civil nuclear research centers in Europe, has existing technical support facilities and expertise, thus reducing the risks.

 

Japan, the United States and South Korea wanted the facility built at Rokkasho in northern Japan.

 

The United States - which is funding 10 percent of construction and considers fusion an important part of its long-term energy plans - had backed Japan's site because it was closer to a port, said Orbach.

"We made it clear from the very beginning that our technical preference was for the Japanese site, but that we would support what was finally (agreed) upon," he said.

 

"We are all dealing with the question of how to address a sustainable and also environmentally friendly energy source for the future, and fusion is extremely promising," EU Research Commissioner Janez Potocnik said.

 

Japanese newspaper reports said Tokyo was prepared to give up hosting the project in return for a bigger research and operations role. The deal concluded Tuesday assured Tokyo of that.

 

The EU and Japan have reached an agreement on a broader cooperation in developing fusion energy to make it a commercially viable source of energy.

 

The EU also will support a Japanese candidate for the post of the ITER director general and back the construction later of a demonstration reactor in Japan.

 

"Japan is happy and sad at the same time," said Nariaki Nakayama, Japan's minister for education, science and technology. "We decided to overcome the sorrow and turn the sorrow into joy. Japan in the future will be ready to make a contribution to the development of fusion energy."

---

Associated Press writer Vladimir Isachenkov in Moscow contributed to this report.

 

http://seattlepi.nwsource.com/national/apeurope_story.asp?category=1103&slug=Nuclear%20Fusion%20Site

Par Scorpio
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Mardi 28 juin 2005

Just some links concerning the precise details about this new site: Caradache

 

 

 

http://www.iter.org/

 

http://www.itercad.org/

 

Par Scorpio
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Jeudi 7 juillet 2005
Par Scorpio
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Jeudi 7 juillet 2005

Study Slams Economics Of Ethanol And Biodiesel

 

 

A new joint study from Cornell University and University of California-Berkeley says that fuels produced from biomass are uneconomical as they use much more energy in their creation than the resulting ethanol or biodiesel generates.

 

"There is just no energy benefit to using plant biomass for liquid fuel," said study author and Cornell researcher David Pimentel. "These strategies are not sustainable."

 

The study, appearing in Natural Resources Research, entailed a detailed analysis of the energy input-yield ratios of producing ethanol from corn, switch grass and wood biomass as well as for producing biodiesel from soybean and sunflower plants.

 

The researchers considered such factors as the energy used in producing the crop (production of pesticides and fertilizer, running farm machinery and irrigating, grinding and transporting the crop) and in fermenting/distilling the ethanol from the water mix.

 

For ethanol production, the study found that:

·                     Corn requires 29 percent more fossil

       energy than the fuel produced.

·                     Switch grass requires 45 percent more fossil energy than the fuel produced.

·                     Wood biomass requires 57 percent more fossil energy than the fuel produced.

 

For biodiesel production, the study found that:

·                     Soybean plants requires 27 percent more fossil energy than the fuel produced.

·                     Sunflower plants requires 118 percent more fossil energy than the fuel produced.

 

The researchers acknowledged that finding alternative fuel sources was of great importance but said that bio-fuels were not the answer.

 

"The United State desperately needs a liquid fuel replacement for oil in the near future," says Pimentel, "but producing ethanol or biodiesel from plant biomass is going down the wrong road, because you use more energy to produce these fuels than you get out from the combustion of these products."

 

While bio-fuels may not be the answer to the looming specter of decreasing oil production, Pimentel does advocate the use of burning biomass to produce thermal energy (to heat homes, for example).

 

In closing, Pimentel said the U.S. should focus its efforts on producing electrical energy from photovoltaic cells, wind power and burning biomass and producing fuel from hydrogen conversion. "Ethanol production in the United States does not benefit the nation's energy security, its agriculture, economy or the environment."

 

Ref: Natural Resources Research (Vol. 14:1, 65-76)
Source: Media release - Cornell University

 

http://scienceagogo.com/news/20050605231841data_trunc_sys.shtml
Par Scorpio
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