The fuel-burning stove is the most basic design of a kitchen stove. As of 2012, it was found that "Nearly half of the people in the world (mainly in the developing world), burn biomass (wood, charcoal, crop residues, and dung) and coal in rudimentary cookstoves or open fires to cook their food."[3] More fuel-efficient and environmentally sound biomass cookstoves are being developed for use there.