After nightfall, when trash covers the streets of the busy Kariakoo market here, compactor trucks rumble along followed by men in green uniforms and women wearing skirts and rubber boots.

Armed with brooms and shovels, they sweep up the usual detritus of discarded vegetables and fruit, along with bottles and plastic packaging, and throw it into the maw of the trucks that haul it away to the dump.

In developing countries, trash doesn't easily disappear, so this scene of formal garbage collection signals progress in Dar es Salaam, East Africa's largest city.

But complicating the trash disposal problem is the

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