Climate Central: In South Africa, major cities are subject to regular power outages as electric utility Eskom periodically shuts down parts of its distribution system to take the pressure off the aging national grid. Whole areas of Cape Town and Johannesburg are without power for hours at a time, a "last resort' Eskom is forced to resort to on a regular basis. In Nigeria, the country's biggest wireless service provider, MTN, has said it may have to shut down its services temporarily due to a shortage of diesel,...