Nell Lewis

The world's largest desert is growing. In the last century, the Sahara Desert expanded by more than 10%, now covering an area of more than 3.3 million square miles (8.6 million square kilometers) and…

London - Keeping food fresh without refrigeration is near impossible in the scorching climate of sub-Saharan Africa. But it's hard to power fridges in a region where almost 600 million people live…