Open Fire Cooking (IMAGE) University of California - Berkeley Caption An estimated 3 billion people in the world still cook with open fires and dirty cookstoves, including this mother in Guatemala. Credit Photo by Nigel Bruce, University of Liverpool Usage Restrictions All rights reserved. Non-commercial use with photo credit allowed. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.