Contour bunding is a fairly simple method of retaining topsoil and moisture and is one of several methods being used with significant effect to re-green the Sahara.
It consists of placing lines of stones along slopes and contours on the land to help rainfall soak in, and to stop topsoil washing away.
And that is helping to transform thousands of hectares into productive fields – where nothing grew just a decade ago.
This story has been going around the various media channels for some time popping up every now and then. Good news and positive techniques like contour bunding need coverage because there are relatively simple and inexpensive solutions out there for African farmers located in and around the Sahara.
The technique is explained here.
A report on the success of re-greening the Sahara here.