Nile communities carefully monitored and recorded the river’s flow. Centuries later these records are still being used by water resource managers around the world to analyse unpredictable river flows.
In a bid to ditch fossil fuels, some countries are considering carpeting deserts with solar panels.
Although Niger's quest for entrenching democracy is a good development, poverty and insecurity are obstacles.
The EU has already poured billions of euros into its assistance programs for the Sahel countries. The fundamental principles of this aid need to be rethought if it is to be truly effective.
From June through October, it's not unusual for huge Saharan dust plumes to blow across the Atlantic. They can darken skies but also bring calmer weather and electric sunsets. Here's how they form.
Martian meteorites allow scientists here on Earth to decode that planet's geology, more than a decade before the first missions are scheduled to bring rocks back home from Mars.
Could a small and sunny patch of the Earth's surface power the rest of the world? Here's what the experts say.
A legacy in fossil fuels is likely to help even in the era of renewable energy.
The vast desert could potentially produce more than seven times the electricity requirements of Europe, with almost no carbon emissions.
The solidarity conference by the Southern African Development Community (SADC) can be seen as a reaction to the gradual shift of power towards Morocco.
Scientists have modelled the effects of huge hypothetical energy projects in the desert.
As in the Mediterranean, travel through the Sahara is difficult and unnecessarily dangerous by increased checks and control.
A big rise in armed attacks in the Sahel - and the intensity of the attacks in recent years - is now seen as a major source of concern.
When we think of migrants, we think of them crossing the Mediterranean to come to Europe. Yet 200 years ago, many did it the other way.
If the US, simply focuses on trying to hunt down jihadist leaders in Niger it will be missing an opportunity to address the underlying causes of violence in the region.
Africa's great green wall suffers from a major mismatch between ambition and effort. But that's not to say it should be ditched altogether.
Poverty and conflict mean the nation is struggling to deal with rising temperatures.
By admitting South Sudan and Morocco to the African Union, the continental organisation has proven yet again that its commitment to upholding its own democratic ideals is lacking.
The world's biggest desert used to be green, lush and full of hippos. A new theory suggests humans could have tipped the environment over the edge.
The African Union sees Africa as a sealed off geographic entity. Yet it remains remarkably quiet about the many bits of Africa that are geographically part of it but do not consider it their home.