Drive an hour south of Kumasi, Ghana’s bustling second city, and before long the dense jungle gives way to denuded hills peppered with rickety timber frames. On every slope, gumbooted workers shovel the tawny earth down to muddy pools in the furrows, from whence the sludge is pumped to the frame’s zenith to gush down a shallow ramp lined with webbed plastic matting. At the base, more workers sweep the outflow with metal detectors.
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