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Solar reactors to create fuel

Solar-powered reactors can take carbon dioxide and turn it into carbon monoxide. The same reactors can also be used to turn water into hydrogen and oxygen.

The two can then be reacted together with a catalyst to form hydrocarbon fuels, in a technique known as the Fischer-Tropsch process.  

Fuels made in this way are sufficiently similar to those currently used in cars that major redesigns of engines and refuelling stations should not be necessary. If fuels can be made entirely from atmospheric carbon, running a car on that fuel would be carbon neutral.

One such machine, the Counter Rotating Ring Receiver Reactor Recuperator (CR5), created by a team of scientists at Sandia National Laboratories in Albuquerque, New Mexico, captures carbon dioxide from power plant exhaust fumes. In the future, however, they hope to extract it directly from the air.

The system uses a giant parabolic mirror, which concentrates sunlight on to two chambers separated by spinning rings of cerium oxide. As the rings turn, the cerium oxide is heated to 1500C and releases oxygen into one of the chambers.

The oxygen is then pumped away. As the ring spins, the now de-oxidised cerium moves into the other chamber. Carbon dioxide is pumped in, and the deoxidised cerium steals one of the oxygen molecules, creating carbon monoxide and cerium oxide.

Another team, the Swiss Federal Institute of Technology, Zurich, uses a similar system, but with calcium oxide, zinc oxide and steam, which can create a stream of hydrogen and carbon monoxide. Their system can already use atmospheric carbon dioxide. At the moment the two reactors have problems.

The New Mexico team's system currently only works for a few seconds at a time, while the Swiss model runs at a mere 10 kilowatts. But both hope to improve reliability and yield.

Creating usable fuel from solar energy is a promising way of keeping the world's energy demands satisfied while minimising carbon emissions, Ken Caldeira of the Carnegie Institution of Washington at Stanford University, California 

"This area holds out the promise for technologies that can produce large amounts of carbon-neutral power at affordable prices, which can be used where and when that power is needed," he says. "It is one of the few technology areas that could truly revolutionise our energy future."  

 
Avertible global catastrophe

Some are attuned to the possibility of looming catastrophe and know how to head it off.

Others are unprepared for risk and even unable to get their priorities straight when risk turns to reality.

The Dutch fall into the first group. Three days after the BP oil spill in the Gulf of Mexico began on April 20, the Netherlands offered the U.S. government ships equipped to handle a major spill, one much larger than the BP spill that then appeared to be underway.

"Our system can handle 400 cubic metres per hour," Weird Koops, the chairman of Spill Response Group Holland, told Radio Netherlands Worldwide, giving each Dutch ship more cleanup capacity than all the ships that the U.S. was then employing in the Gulf to combat the spill.To protect against the possibility that its equipment wouldn't capture all the oil gushing from the bottom of the Gulf of Mexico, the Dutch also offered to prepare for the U.S. a contingency plan to protect Louisiana 's marshlands with sand barriers.

One Dutch research institute specializing in deltas, coastal areas and rivers, in fact, developed a strategy to begin building 60-mile-long sand dikes within three weeks.The Dutch know how to handle maritime emergencies. In the event of an oil spill,

The Netherlands government, which owns its own ships and high-tech skimmers, gives an oil company 12 hours to demonstrate it has the spill in hand. If the company shows signs of unpreparedness, the government dispatches its own ships at the oil company's expense. "If there's a country that's experienced with building dikes and managing water, it's the Netherlands ," says Geert Visser, the Dutch consul general in Houston .

In sharp contrast to Dutch preparedness before the fact and the Dutch instinct to dive into action once an emergency becomes apparent, witness the American reaction to the Dutch offer of help. The U.S. government responded with "Thanks but no thanks," remarked Visser, despite BP's desire to bring in the Dutch equipment and despite the no-lose nature of the Dutch offer --the Dutch government offered the use of its equipment at no charge.

Even after the U.S. refused, the Dutch kept their vessels on standby, hoping the Americans would come round. By May 5, the U.S. had not come round. To the contrary, the U.S. had also turned down offers of help from 12 other governments, most of them with superior expertise and equipment --unlike the U.S. ,

Europe has robust fleets of Oil Spill Response Vessels that sail circles around their make-shift U.S. counterparts.Why does neither the U.S. government nor U.S. energy companies have on hand the cleanup technology available in Europe ?

Ironically, the superior European technology runs afoul of U.S. environmental rules. The voracious Dutch vessels, for example, continuously suck up vast quantities of oily water, extract most of the oil and then spit overboard vast quantities of nearly oil-free water. Nearly oil-free isn't good enough for the U.S. regulators, who have a standard of 15 parts per million -- if water isn't at least 99.9985% pure, it may not be returned to the Gulf of Mexico .

When ships in U.S. waters take in oil-contaminated water, they are forced to store it. As U.S. Coast Guard Admiral Thad Allen, the official in charge of the clean-up operation, explained in a press briefing on June 11, "We have skimmed, to date, about 18 million gallons of oily water--the oil has to be decanted from that [and] our yield is usually somewhere around 10% or 15% on that."

In other words, U.S. ships have mostly been removing water from the Gulf, requiring them to make up to 10 times as many trips to storage facilities where they off-load their oil-water mixture, an approach Koops calls "crazy."

The Americans, overwhelmed by the catastrophic consequences of the BP spill, finally relented and took the Dutch up on their offer -- but only partly. Because the U.S. didn't want Dutch ships working the Gulf, the U.S. airlifted the Dutch equipment to the Gulf and then retrofitted it to U.S. vessels.

And rather than have experienced Dutch crews immediately operate the oil-skimming equipment, to appease labour unions the U.S. postponed the clean-up operation to allow U.S. crews to be trained.A catastrophe that could have been averted is now playing out.

With oil increasingly reaching the Gulf coast, the emergency construction of sand berns to minimize the damage is imperative. Again, the U.S. government priority is on U.S. jobs, with the Dutch asked to train American workers rather than to build the berns. According to Floris Van Hovell, a spokesman for the Dutch embassy in Washington ,

Dutch dredging ships could complete the berms in Louisiana twice as fast as the U.S. companies awarded the work. "Given the fact that there is so much oil on a daily basis coming in, you do not have that much time to protect the marshlands," he says, perplexed that the U.S. government could be so focussed on side issues with the entire Gulf Coast hanging in the balance.

Then again, perhaps he should not be all that perplexed at the American tolerance for turning an accident into a catastrophe. When the Exxon Valdez oil tanker accident occurred off the coast of Alaska in 1989, a Dutch team with clean-up equipment flew in to Anchorage airport to offer their help. To their amazement, they were rebuffed and told to go home with their equipment.

The Exxon Valdez became the biggest oil spill disaster in U.S. history--until the BP Gulf spill.

 
Dutch plastic bottle island

A large island made entirely from plastic bottles could become the hottest postcode on earth, and is part of an incredible environmental vision for the future.

Dutch scientists plan to take 44 million kilos of plastic waste currently bobbing around in the Pacific Ocean and transform it into Recycled Island.Solar and wave energy will be used to sustain the island and its 500,000 inhabitants.

A spokesman for the project said: 'The proposal has three main aims; cleaning our oceans from a gigantic amount of plastic waste; creating new land; and constructing a sustainable habitat.'Recycled Island seeks the possibilities to recycle the plastic waste on the spot and to recycle it into a floating entity.'  

The Pacific Ocean currently holds the largest amount of plastic waste in the world. Ocean currents keep the plastic in the sea in giant rubbish dumps, which are fatal to sea life.Sea birds, like the giant Albatross, see the plastic as food and fish too eat smaller pieces of it.

The team plans to recycle plastic on the spot - in the North Pacific Gyre - into hollow, floating blocks.These will become the foundation blocks to the 10 square kilometres (3,86 square mile) island.Alongside the modern city, planners hope to create a large area preserved for agriculture.

The island will be designed as self-sufficient, providing food and work for the inhabitants.The spokesman added: 'Recycled Island should be seen as a unique opportunity to create a new floating habitat from scratch, yet at the same time the ocean is cleaned from a huge part of its plastic pollution.' 

 
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