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Bacteria Could Help Stop Desertification

Bridgette Steffen writes "In attempt to slow down desertification, a student at London's Architectural Association has proposed a 6000 km sandstone wall that will not only act as a break across the Sahara Desert, but also serve as refugee shelter. Last fall it won first prize in the Holcim Foundation's Awards for Sustainable Construction, and will use bacteria to solidify the sandstone."

54 of 218 comments (clear)

  1. deserts move all the time by timmarhy · · Score: 2, Insightful

    why exactly are we to interfer with this process?

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    1. Re:deserts move all the time by ustolemyname · · Score: 3, Insightful

      Because humans always assume that the way things are is the best way for them to be.

    2. Re:deserts move all the time by The+Yuckinator · · Score: 5, Insightful

      It's what we do. We interfere with processes all the time.

      I'm a big fan of interfering.

    3. Re:deserts move all the time by Gravedigger3 · · Score: 2, Informative

      Perhaps because most of the times when man believes himself wiser than nature we end up learning different.

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    4. Re:deserts move all the time by Anonymous Coward · · Score: 4, Insightful

      why exactly are we to interfer with this process?

      Because moving the farmers would require something approaching socialism, and not moving the farmers would require something appraching starvation.

      Moving the desert is a better choice.

    5. Re:deserts move all the time by Sir_Lewk · · Score: 5, Insightful

      Nature is not "wise", and it is wrong to personify it or otherwise assume otherwise. All nature does is follow the path of least resistance.

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    6. Re:deserts move all the time by ScentCone · · Score: 4, Insightful

      There is no reason to argue with conservatives

      Except it's usually the loopy lefty crunchy hippy types that actually most often anthropomorophize nature, assign it a personality, presume they know what it wants and how it should be, etc. You know it's true.

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    7. Re:deserts move all the time by Profane+MuthaFucka · · Score: 5, Funny

      Who the hell are you? Muad'Dib?

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    8. Re:deserts move all the time by powerslave12r · · Score: 2, Funny

      follow the path of least resistance.

      That's how I'm working on my thesis.

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    9. Re:deserts move all the time by rolfwind · · Score: 4, Insightful

      I was watching a program last night about the evolution of the planet, something about vulcanic activity and the superplume, and other things, as well as the evolution of the first landwalkers (tulogs?) that basically looked like a cross between crocodiles and fish, among all the changes in the environment, as well as mass ocean pollution (millions of years ago) killing a vast number of species.

      When someone says nature is wise, they probably are romantizing how much "nature"/god? cares about our survival as a species but also don't want to be at the short end of the evolutionary stick when nature shows it' uncaring side and things change. I'm sure a man-made solutions to various things would be welcomed with open arms then.

    10. Re:deserts move all the time by Gravedigger3 · · Score: 2, Insightful
      This article proposes that we could influence the climate of a large part of the African continent using a wall, albeit a very imaginative wall.

      This seems to have 2 very obvious problems...

      first of all, this is what they are talking about harnessing with that wall. I hope those bacteria aren't afraid of heights.

      Second, I am no environmentalist (proud to say), but seems to me that making such a large impact on the worlds climate (and the Sahara sandstorm is a force that has effects on the entire globe) is something that could have many unforseen effects.

      I am no hippie but whenever it comes to a discussion about making a major "upgrade" to our environment I remain suspicious. Nature itself may not be wise.... but its balanced. We have a way of upsetting that balance in the interest of making things "better" for us.

      Sometimes the risk and effort is worth it, but this doesn't seem like one of those cases in its current stage.

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    11. Re:deserts move all the time by m50d · · Score: 3, Insightful
      It's hardly anthropomorphic to describe nature as self correcting. Life on earth survived for what, like a billion years without modern man fucking it up? Pretty much a model for sustainability if you ask me.

      Life as a whole survived, sure, but there were changes and extinctions, just as there are now. It's sustainable only in the way that everything is.

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    12. Re:deserts move all the time by Moridineas · · Score: 2, Insightful

      It's hardly anthropomorphic to describe nature as self correcting. Life on earth survived for what, like a billion years without modern man fucking it up? Pretty much a model for sustainability if you ask me.

      It's hardly anthropomorphic to describe nature as self correcting? Really? That implies that there is something to correct, which implies ... . Not to mention describing some universal aspect of "Life" which the existence of an unbalanced humanity can "fuck up?" Sounds pretty anthropomorphized to me.

      The crux of the matter seems to be, what do you mean by "self correcting?" I'm also unsure why you bring modern man into the equation. Surely you're aware of a multitude of previous mass extinctions? Surely you're aware of the extinction of not only species but of entire orders of life? Maybe I'm misunderstanding what you're saying, but when you say "without modern man fucking it" you make it sound like humans are something exceptional in terms of extinctions?

      A balanced and closed ecosystem is naturally self correcting. Humans will prove no different. The available resources will be consumed, humans will die off in large numbers and a balance will be reached eventually where real sustainability can be achieved.

      Ah yes, sustainability...the new holy grail.

      The only thing "self correcting" or "sustainable" about life on earth is that there is life on earth.

    13. Re:deserts move all the time by 644bd346996 · · Score: 3, Insightful

      When people describe nature as self-correcting, they aren't usually referring to any inherent right or wrong. What gets corrected is imbalance, such as restoring a predator-prey system to equilibrium. It seems to me that discussing natural equilibria doesn't have to involve intent, purpose, morals, or anything else that would make it anthropomorphic to say that nature is self-correcting.

    14. Re:deserts move all the time by timmarhy · · Score: 2, Insightful

      i'm not conservative. if you want to see a bunch of conservatives take a look at the environmental movement

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    15. Re:deserts move all the time by palegray.net · · Score: 2, Insightful

      Modern man is a part of the modern ecosystem, and occupies the top slot in the food chain. The planet is ours, period, and given technological advances it's highly unlikely that mankind will render the planet uninhabitable. Other species are not deserving of any special treatment. Get over it.

    16. Re:deserts move all the time by Moridineas · · Score: 5, Insightful

      Right, I understand that (and almost didn't say what I did, how I did..) but then again, what is balance in nature--what does that mean?

      I don't think there is any (forgive the term) "natural" state which is the proper and balanced state. Everything in nature is constantly in flux. Sure, to use the common example of the predator-prey equilibrium, that is sometimes the case. Sometimes the predators go extinct, sometimes prey go extinct, sometimes they both do.

      It seems to me that it's far easier to look at life on Earth through the lens of evolutionary bubbles and crashes. It only seems self correcting because we want to apply some kind of order to it, when it reality, that's just the way the universe works. When a forest fire burns, it burns everything it can, until it's burned too much and dies out. That seems about the same level of self correcting to me.

    17. Re:deserts move all the time by interkin3tic · · Score: 3, Funny

      why exactly are we to interfer with this process?

      Gotta do SOMETHING with all that bacteria and sand.

    18. Re:deserts move all the time by Antique+Geekmeister · · Score: 3, Insightful

      Because we _caused_ the desert. Overpopulation, Overgrazing goats, digging for aquifers, using imported fertilizers, etc., helped destroy modest existing ecosystems that stabilized the soil and retained soil at the desert's border. Looked at over thousands of years of geological and archaelogical history, it seems clear that humans created or wildly expanded the deserts. There were amazing small areas that weren't overfarmed and avoided overpopulated, as experiments, and they showed up as remaining green and fertile as the desert grew right past them. It made the cause of desert growth quite clear.

    19. Re:deserts move all the time by HungryHobo · · Score: 3, Insightful

      I sometimes wonder why there isn't more effort made to collect genetic material from endangered species.

      I consider killing the last of a species similar to burning the very last copy(in any media) of a book. So much information lost.

    20. Re:deserts move all the time by daem0n1x · · Score: 3, Insightful

      Because we are the main responsible for desertification.

      I live in the south of Europe. It's highly likely that the Sahara crosses the Gibraltar Strait and comes knocking on my door. When that happens we'll all wish we have "interfered" more.

      Up to the moment, the unbelievable stupidity (from politicians, companies and common people) in managing land goes to such an extent that makes me wonder if it's not intentional and there's a hidden conspiracy to turn my country into a desert.

      Better start thinking about buying a camel.

    21. Re:deserts move all the time by MrMarket · · Score: 2, Insightful

      Right, I understand that (and almost didn't say what I did, how I did..) but then again, what is balance in nature--what does that mean?

      I think most people would consider "balance" as balanced in the favor of human habitation. As a species we are probably most interested in maintaining the organisms and ecosystems required for a comfortable human existence.

  2. Specifics by gcnaddict · · Score: 5, Informative

    So basically, Bacillus Pasteurii will be used to actually turn the sand into sandstone instead of waiting for thousands of years or using other kinds of walls.

    To be honest, the part which is more interesting is the fact that desertification will be stopped by using a wall. Sure, the Slashdot summary used bacteria as a hook, but in all honesty, the wall is more important than the bacteria anyway, which is why there's only a small mention of the bacteria in the source article.

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    1. Re:Specifics by rolfwind · · Score: 4, Interesting

      I read a while ago about a German guy who invented a way to make farmable land out of desert:
      http://www.spiegel.de/international/business/0,1518,551152,00.html
      (He moved on to make a radar camoflaging paint):

      "The project seemed promising at first, as cucumbers, radishes and beans thrived on Nickel's test fields on the outskirts of Abu Dhabi. But the project also consumed vast numbers of worms -- 3,000 per square meter, to be exact -- which eventually made the project too costly for its sponsors."

      I wonder what the costs between the two projects are or if they could be used in conjuction with each other (to lower costs) somehow.

    2. Re:Specifics by Anonymous Coward · · Score: 5, Funny

      Someone needs to genetically engineer a big desert worm.

    3. Re:Specifics by adavies42 · · Score: 4, Funny

      /me rushes to patent the thumper

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  3. How will a wall help ? by ianare · · Score: 3, Informative

    A main part of the problem is that sand storms blow so much sand on surrounding grasslands, it kills the plants and spreads the desert. I don't see how a wall could help, unless it was kilometers high. It would need to stop this ?

    1. Re:How will a wall help ? by Tubal-Cain · · Score: 2, Interesting

      If most of the sand blows along the ground, it will collect at the base of the wall until it becomes a long sand dune. Since they are using bacteria, I could imagine them then solidifying the uppermost portion of the dune to make it higher. Rinse and repeat until your mountain (or hill) chain stops growing.

    2. Re:How will a wall help ? by evilviper · · Score: 5, Insightful

      I don't see how a wall could help, unless it was kilometers high. It would need to stop this ?

      The vast majority of the sand is traveling very low to the ground. Sure, there's still a nice big dust cloud up high, but that big tall plume represents the least dense of the material, which is why it rises to the top.

      You're essentially asking, "why have a sea wall if the very tops of the largest waves might still occasionally break over the top?"

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    3. Re:How will a wall help ? by Sir_Lewk · · Score: 2, Insightful

      I'm personally wondering what would prevent this wall from just catalyzing the formation of a massive sand dune, which would eventually rise above the wall, effectively rendering the wall useless. Unlike the Ocean, once sand rises up against the wall it isn't going to flow back out later.

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    4. Re:How will a wall help ? by ianare · · Score: 2, Informative

      Well they have the same problem with desertification in China, where the Gobi and 2 other smaller deserts are growing. Beijing gets regular sandstorms now because of this. It seems like mountains and yes, the Great Wall of China, has little effect in preventing these.

    5. Re:How will a wall help ? by polymeris · · Score: 3, Insightful

      Unlike the Ocean, once sand rises up against the wall it isn't going to flow back out later.

      Unlike the ocean? Same thing happens there. Actually in some places walls are constructed along coastlines to trap sand for beach nourishment.

    6. Re:How will a wall help ? by MichaelSmith · · Score: 3, Interesting

      Years ago I read about a plan to build a huge wall (for want of a better name) in central Australia. The wall would be thousands of metres high with a triangular cross section. In effect, an artificial north-south mountain range. The idea is that a lot of water vapour crosses Australia without precipitating because it never gets pushed to high enough altitudes to cool and condense. The article also suggested that the interior of the mountain could be used to store grains. I suppose these days we would put Afghan refugees in there as well.

    7. Re:How will a wall help ? by ben0207 · · Score: 3, Insightful

      Sandtrout and wind traps, duh.

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    8. Re:How will a wall help ? by evilviper · · Score: 2, Informative

      It seems like mountains and yes, the Great Wall of China, has little effect in preventing these.

      The great wall of China wasn't designed as a wind break. In fact it's in the worst possible location (right at the top of mountains), presenting the bare minimum of resistance to updraft airflow.

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  4. Re:I for one by FooAtWFU · · Score: 2, Funny
    TFA also has a blurb about "sustainable" bricks... made out of cow dung.

    No word on your mortar yet, but you can keep your overlords kthxbye.

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  5. Details by interiot · · Score: 4, Insightful

    The most information I could find is here (the full-size images are pretty large) and here.

    It's hard to pick through the information, but is this scientifically viable? Or is this the random musings of an architecture student focusing only on the architecture side, and ignoring the biology side?

    1. Re:Details by belmolis · · Score: 3, Informative

      Actually, many scientists believe that the expansion of the Sahara desert is due to loss of vegetation due to over-grazing.

  6. Re:I for one by Profane+MuthaFucka · · Score: 5, Funny

    If our overlords are shitting out dung, no matter how useful, I'd prefer then to be underlords, or over-to-one-side-lords, or not-over-my-head-at-least-lords.

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  7. Re:A shield wall works great... by c_forq · · Score: 4, Funny

    Nonsense. You can't use atomics on shields, you can only use them on geological features. Otherwise the other great houses will obliterate you.

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  8. Dune Grass in the PNW by jdvogt · · Score: 2

    As I understand the dune-grass in Northern Canada up through Oregon and Washington is invasive and a foreign species. It was originally planted as a way to stop erosion of some beaches and spread out of control almost overnight. What's to prevent something like this happening / getting out of control and wrecking the natural ecosystem of our planet's deserts?

    1. Re:Dune Grass in the PNW by Locke2005 · · Score: 4, Funny

      Other invasive species that were intentionally introduced but are now wrecking havoc in the northwest include English Ivy, Himalayan Blackberry, and Californians.

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    2. Re:Dune Grass in the PNW by hairyfeet · · Score: 2, Informative

      And here in Dixie we have "the weed that ate the south", also known as Kudzu. In the south it was introduced to stop soil erosion and now that crap is everywhere. Telephone poles, abandoned buildings, pretty much anything standing still ends up covered in Kudzu. If you look at pics like this ( which I have seen whole tracts of land, buildings and all, swallowed up like this) you see why we have to be careful about these great ideas of making the land better by introducing new elements like in TFA. What may help in the short term may turn seriously nasty in the long.

      I mean just look at how far the Kudzu has spread, and as the neighboring states have a mild winter it won't take it long for the Kudzu to spread. And once that crap gets a foothold good luck getting rid of it. So while slowing down desert expansion is a nice idea and all, I would want to see some serious testing done on a smaller scale to make sure there isn't some "ooops" we haven't thought of.

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  9. Re:I for one by electrosoccertux · · Score: 2, Funny

    If our overlords are shitting out dung, no matter how useful, I'd prefer then to be underlords, or over-to-one-side-lords, or not-over-my-head-at-least-lords.

    Some aborigines consider dung a delicacy, you insensitive clod!!! Consider it a "desert" if you will...

  10. It's called "Bacterial cement" by S3D · · Score: 4, Informative

    Little googling revealed that bacteria could actually do it.
    Bacterial cement However bacteria need nutrient (urine base btw) to do it. It may happens simple concrete could actually be cheaper.

    1. Re:It's called "Bacterial cement" by commodoresloat · · Score: 2, Insightful

      Little googling revealed that bacteria could actually do it.

      Beats the hell out of reading the article!

  11. Another pathetic attempt... by Mr.+McGibby · · Score: 3, Funny

    ...by artists so full of themselves that they think can understand and harness something like stone-making bacteria. I know many of these types. They want to discuss ad nauseum every single scientific advancement and it's cultural implications, thinking that they can make some important contribution to the field. It's obvious these guys don't have a clue, as they think that an ice-nine scenario is something that, first nobody thought of, and second is even possible. These are the same people who hear about the LHC and think that there's a good chance that the universe might implode when they turn it on. As if the world works like it does in the politically motivated somewhat-sci-fi books that are all the rage in these circles.

    Please, stay in the coffee shops in the village, discussing the importance of your latest pathetic attempt at relevance through putting mannequin arms in toilets bowls and calling it art.

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  12. Boring by Locke2005 · · Score: 4, Funny

    I propose genetically engineering bacteria that turn sand into chocolate in an attempt to speed up dessertification, with a side effect of feeding starving refugees.

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  13. Re:I for one by commodoresloat · · Score: 4, Funny

    If our overlords are shitting out dung

    Actually, we should start to worry if they start shitting out anything other than that. At the very least I'd say a trip to the doctor is in order.

  14. Bacteria that stops decertification? by WetCat · · Score: 2, Funny

    I would love to see that bacteria stop my CCNA from expiration.

  15. Re:Is there any desertification to stop though? by interkin3tic · · Score: 2, Interesting

    Where that is defined as deserts which are advancing, and whose advance is not containable by substitution of sustainable farming practices for unsustainable ones...

    Kind of a trivial semantic argument right there. Whatever the cause, whatever you call it, it's not good for people who are going to be living in sand soon.

    There is no such evidence. All that is needed is sensible traditional mixed farming. And a lot less journalistic blather about desertification that is not happening, global warming that is not happening, and how the one imaginary event is a consequence of the other imaginary event. And for well meaning idiots to stop subsidizing goats.

    It would be nice if they practiced responsible farming, yes. Why isn't that happening already? Is there another problem upstream of unsustainable farming practices that's causing everyone to farm stupidly? Like maybe dumb economic systems that make it such that anyone who farms anything besides goats is quickly going to lose the farm and be replaced by someone who only raises goats?

    I don't know if that's the case or not, but I do know that simple answers, like the one you just gave, never work on complex problems, like the one being discussed.

  16. What nonsense by clickety6 · · Score: 4, Funny

    Where do they expect to get enough sand to build a wall 6000 km long?

     

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  17. Re:I for one by dna_(c)(tm)(r) · · Score: 4, Funny

    TFA also has a blurb about "sustainable" bricks... made out of cow dung.

    That's just bullshit

  18. Re:I for one by robthebloke · · Score: 3, Interesting

    because they are idiots. I tried some once (my housemate got some for Christmas), it tastes exactly the same as weak coffee. Utterly pointless.