Half a billion people around the world depend on rudimentary cookstoves to prepare their daily meals. Although such traditional stoves have been used for generations, policymakers now recognize them to be a major health hazard. The smoke emitted from traditional cookstoves contributes to household air pollution, which is responsible for the deaths of four million people each year, according to a December 2012 study in The Lancet.

In Bangladesh, more than 100 concerned groups have made efforts...

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