Siyaram Sikarwar cooks with a fire made from wood and cakes of cow dung at her home in Kolma, Uttar Pradesh. Around the world, women and children can spend up to several hours each day collecting these and other solid fuels to fire traditional cook stoves. The WHO estimates that breathing the smoke from traditional cook stoves and open fires caused nearly 2 million premature deaths worldwide in 2004, the most recent year for which there are data.