More than a century after the discovery of electricity, billions – yes, billions – of people still heat and cook with wood fires. In the developing world, indoor air pollution from smoke is blamed for nearly 2 million deaths per year.
Burning wood, crop waste, charcoal or dung does the damage, filling homes with smoke and blackening walls. It’s women and children who suffer the most, because they are the ones tending the fires.
But it’s not an easy a problem to fix.
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