International Herald Tribune: They cost more than the people who need them can afford. They belch out noxious fumes. They often cause fires, and it isn’t safe to leave kids alone with them in case they accidentally burn themselves, or drink poisonous fluid. Why do people use them? Because they don’t have a choice. If you lived in a home without electricity like most people in sub-Saharan Africa do, how else would you light it after dark other than with potentially lethal kerosene lamps? Candles? They’re dangerous …