the two-burner electric cookstove is a simple device, but it would bring magnificent change to the 3.5 billion people who now cook food and get light and heat by burning biomass: wood, dung, and crop residue. According to a 2002 WHO report, 36 percent of acute upper respiratory infections, 22 percent of chronic obstructive pulmonary disease, and 1.5 percent of all cancers are all caused by indoor air pollution resulting from this practice. Thus an electric cookstove relieves 4 percent of the global disease burden. Ever better—and just like water—the electric cookstove is another example of an
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