"The degradation of the environment of the Nairobi rivers is reaching a critical stage. With the increasing of population now to more than three million people, the waste problems have actually overwhelmed the ecosystem," he said, adding that the city now generates 3,000 tonnes of waste a day.
Ndede noted that 70 percent of the city's population live in informal settlements -- or slums -- often located in the river valley and with no sanitation systems.
"What the stove has done is basically make rubbish into something you can use," UNEP chief Achim Steiner told Kibera residents on a recent visit.
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