“Yes, people use dried animal dung,” according to Dr. Robert F. Harder, Professor and Chair of the Mathematics, Computer Science and Engineering Department at George Fox University. Not surprisingly, charcoal is the preferred fuel. In some places oil, petroleum and propane are used. “But really, charcoal is the cheapest to use, it’s the most readily available, and people are very familiar with it.” The danger is that Africa’s forests could be severely devastated by 2050. Fortunately, new trees can be planted to offset the deforestation. “If we’re planting trees, it’s in a sense carbon neutral.”
From The Justice Conference 2012.