WINROCK INTERNATIONAL

More than half of the world's population-three billion people-cook their food and heat their homes by burning coal and biomass, including wood, dung, and crop residues, in open fires or rudimentary stoves. Indoor burning of solid fuels releases dangerous particulate matter, carbon monoxide, and other toxic pollutants, and releases greenhouse gases into the air. The resulting indoor air pollution levels are 20 to 100 times greater than the World Health Organization's (WHO) air quality guidelines allow. Unfortunately, the health risks and threats to the environment are on the rise: the International Energy Agency estimates that 200 million more people will use these fuels by 2030.