posted 06-05-2002 08:33 AM            

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Earth Summit 'will produce 500,000 tons of greenhouse gas'
By Charles Clover, Environment Editor
(Filed: 04/06/2002)

The 60,000 delegates to the Earth Summit in Johannesburg this September will produce the same volume of greenhouse gases through air flights, ground transport and hotel pollution as would half a million ordinary Africans in a year.

The British company Future Forests, which has been asked to devise a way of offsetting the emissions, estimates that the summit, which is to concentrate on alleviating the environmental problems of the world's poorest people, will produce nearly 500,000 tons of carbon dioxide.

This is the amount produced annually by 44,000 Britons or 450,000 Africans.

The summit's South African organisers aim to raise £3.5 million to offset this pollution through energy-saving school programmes, solar power schemes and bio-gas plants.

The savings, based on a scheme that offset the emissions from the Salt Lake City winter Olympics, will be audited by an American company, Carbon Neutral Network. Jonathan Shopley, chief executive of Future Forests, said he was optimistic of receiving sufficient funding for the scheme from companies and individuals.

Margaret Beckett, the Environment Secretary, left for Bali yesterday with her husband Leo for the final preparatory conference before the Johannesburg summit.

This week's talks on drawing up a plan of action to present to Tony Blair and other world leaders at the summit have already run into trouble.

British officials said at the weekend that America was opposing plans to halve the number of people - 2.4 billion, two fifths of the world's population - who have no sanitation.

European and developing nations want the world's leaders to agree to meet this target by 2015.

Opec countries are opposing plans to halve the number of people, currently two billion, without any source of energy using renewable means.

America, Canada, Japan and Australia are opposing EU proposals to make energy consumption more environment-friendly.

posted 06-06-2002 12:06 AM               

LOS ALAMOS, N.M., April 9, 2002 -- Researchers at the U.S. Department of Energy's Los Alamos National Laboratory are studying a simple, cost effective method for extracting carbon dioxide directly from the air — which could allow sustained use of fossil fuels while avoiding potential global climate change.

The method would allow researchers to harvest carbon dioxide from the air, reducing buildup of the so-called "greenhouse gas" in the atmosphere and allowing it to be converted into fuel. A Los Alamos-led research team today presented the topic at the 223rd annual meeting of the American Chemical Society in Orlando, Fla.

"Fossil fuel supplies are plentiful, and what will limit the usage of fossil fuels is the potential climatic and ecosystem changes you may see as a result of rising CO2 levels in the atmosphere," said Los Alamos researcher Manvendra Dubey. "If you can capture atmospheric carbon dioxide, then you limit the environmental impact of fossil fuels and you can continue to use them. We have come up with a way to capture and sequester the carbon dioxide that we are putting in the atmosphere. Our approach is particularly well suited to capturing CO2 from numerous small sources such as automobiles that are largely being ignored."

While many scientists are working on capturing or sequestering carbon, Dubey and his colleagues' method differs because it works on a dilute stream of CO2 in the atmosphere as opposed to capturing more concentrated forms found in power plant exhausts. The method uses ordinary air with its average carbon dioxide concentration of about 370 parts per million.

It utilizes the wind and natural atmospheric mixing to transport CO2 to a removal site, and it is the only means available to capture CO2 generated from transportation sources and small, dispersed sources that account for nearly half of all carbon dioxide emissions.

The air is passed over an extraction agent, for example a solution of quicklime, the active agent in some cement. As the air passes over the extraction structure, the carbon dioxide in the air reacts with the quicklime and becomes converted to calcium carbonate (limestone), a solid that forms and falls to the bottom of the extractor.

The calcium carbonate is then heated to yield pure carbon dioxide and quicklime, which is recycled back into the extractor. The purified and liberated carbon dioxide can then be sequestered as a gas by direct injection into the ground or it could be reacted with minerals to form a solid.

Carbon dioxide gas also can be sold commercially to the petrochemical industry, which uses large quantities of it to extract fossil fuels. Of course, because the process uses existing air, it does not need to be located near any particular elevated source of carbon dioxide.

It captures carbon dioxide from all sources by harnessing wind as a no-cost transportation vector.

"The carbon dioxide comes to the facility on its own," Dubey said. "And because treated air is discharged, the overall concentration of carbon dioxide in the atmosphere gradually decreases over time. Using this method on a large enough scale, it may be possible to return atmospheric carbon dioxide levels to pre-Industrial-Age concentrations.
Given the possibility our climate system can change abruptly, this possibility is very exciting."

Cost of the entire process is equivalent to about 20 cents per gallon of gasoline — a nominal cost when one considers the recent price fluctuations at gasoline pumps across the nation, Dubey said. A typical extraction facility that could extract all current carbon dioxide emissions would require only an area of one square yard per person in the developed world. A facility of sufficient size could be located in arid regions, since discharged air that is deficient in carbon dioxide could have consequences on nearby plant life.

Large expanses of desert would not be affected by the CO2 deficit however, and could provide the wide-open spaces necessary both for the facility and to allow the discharged air to become well mixed with the atmosphere again.

The next step for Dubey and his colleagues is to use intense computer models to optimize the configuration of the extractor as well as design alternative chemicals for extraction.

Dubey's research colleagues include Hans Ziock, Scott Elliott and William S. Smith of Los Alamos; Klaus Lackner, formerly of Los Alamos and now also at Columbia University; and Pat Grimes of Grimes Associates of Scotch Plains, N.J.Los Alamos National Laboratory is operated by the University of California for the National Nuclear Security Administration (NNSA) of the U.S. Department of Energy and works in partnership with NNSA's Sandia and Lawrence Livermore national laboratories to support NNSA in its mission.

posted 06-06-2002 12:36 AM               

Heat...let me guess...nuclear power, burning fossil fuels, what...how?