The soils on which African farmers depend are getting poorer, writes Fernando Naves Sousa, depleted of nutrients and organic matter. This creates a huge challenge: to reverse the trend in an environmentally responsible way, while feeding a growing population. But it can be done - using organic composting techniques.
Mali's elephants have lived for millennia in the inhospitable Sahara, writes Susan Canney. But with their survival at risk from a host of modern, 21st century threats, local people are coming together to protect them - and finding that they too are benefiting.