Register for an account

X

Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.

X

Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

Planet Earth

Can Bacteria Create a Cement Wall to Hold Back the Sahara?

80beatsBy Eliza StricklandJuly 27, 2009 10:04 PM
sahara-dunes.jpg

Newsletter

Sign up for our email newsletter for the latest science news

To stop the spread of the Sahara Desert, one innovative thinker has proposed a bold plan: a wall along the southern border of the desert that would hold back the advancing dunes. Swedish architect Magnus Larsson says the

wall would effectively be made by "freezing" the shifting sand dunes, turning them into sandstone. "The idea is to stop the desert using the desert itself," he said. The sand grains would be bound together using a bacterium called Bacillus pasteurii commonly found in wetlands." It is a microorganism which chemically produces calcite - a kind of natural cement" [BBC News].

Larsson is

already well-known in the field thanks to his proposed Great Green Wall, a 4,349 mile line of trees stretching across Africa to stop desertification [Fast Company].

The sandstone wall could compliment the green wall, Larsson says, because if people chopped down the trees for firewood the sandstone wall would still remain. The architect unveiled his proposal at the TEDGlobal conference in Oxford, dedicated to "ideas worth spreading." Larsson explained that the

bacterium would get into the dunes either by injecting it (on a massive scale) or by giant balloons filled with it -- these would be place in the way of the moving dunes, which would wash over the balloons, which in turn would be popped allowing the bacteria to get into the sand [Treehugger].

Larsson acknowledges that the scheme faces political, practical, financial, and ethical challenges.

"However, it's a beginning, it's a vision; if nothing else I would like this scheme to initiate a discussion," he added [BBC News].

Related Content: 80beats: Architects Propose Fantastic Greenhouses Across the Sahara 80beats: A Solar Power Plant in the Sahara Could Power All of Europe DISCOVER: How to Make a Desert

Image: flickr / kashmir

2 Free Articles Left

Want it all? Get unlimited access when you subscribe.

Subscribe

Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 70%

Subscribe

Already a subscriber? Register or Log In