More than 2.7 billion people in developing countries rely on biomass for cooking with profound implications for their well-being. Two million people die every year due to cooking related smoke emissions - more than are killed by malaria. In recent years, an international movement has gained...

Recent household surveys from 52 developing economies that include questions about energy use show that the most commonly cited primary energy for cooking is wood, followed by gas, natural gas and, where natural gas is not available, liquefied petroleum gas (LPG), and then by electricity. Biogas...