Stephen (left) and Shadrack (center) Osero from Kenya discuss their project for using human waste as a source of green power at this year's Climate CoLab conference at MIT. The brothers were among the winners of this year's CoLab contest, which crowdsourc

Stephen (left) and Shadrack (center) Osero from Kenya discuss their project for using human waste as a source of green power at this year's Climate CoLab conference at MIT. The brothers were among the winners of this year's CoLab contest, which crowdsources ideas for addressing problems related to climate change.

Credit:

Dominick Reuter/MIT

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