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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."

35 of 218 comments (clear)

  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. 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. 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.

  4. 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 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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    2. 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.

    3. 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.

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

      Sandtrout and wind traps, duh.

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  5. 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.

  6. 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.

  7. 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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  8. 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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  9. 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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  10. 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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  11. Re:deserts move all the time by Profane+MuthaFucka · · Score: 5, Funny

    Who the hell are you? Muad'Dib?

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  12. 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.

  13. 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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  14. 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.

  15. 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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  16. 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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  17. 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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  18. 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.

  19. 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.

  20. 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.

  21. 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.

  22. 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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  23. 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.

  24. 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

  25. 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.

  26. 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.

  27. 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.