Designing cleaner stoves for the developing world
Video duration: 7:46
An estimated 3 billion people worldwide rely on open-fire cookstoves that burn wood, dung or crop residues for food preparation. But the smoke from these stoves harms the environment and can be blamed for some 2 million deaths every year. Special correspondent Fred de Sam Lazaro reports from El Salvador on efforts to provide cleaner stoves to people in developing countries.