Facebook is trying to help change that by creating a high-resolution population density map ... Africa, for instance, spans 150,000 square miles but contains just 55,000 people. In an area that ...

The team have produced the most detailed map yet of the scale and potential ... "Where there's greatest ground water storage is in northern Africa, in the large sedimentary basins, in Libya ...

The team have produced the most detailed map yet of the scale and potential ... "Where there's greatest ground water storage is in northern Africa, in the large sedimentary basins, in Libya ...