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Yvel Neprius works on a biodigester being built at the San Marcial Catholic School in Port-au-Prince, Haiti. One of four pilot projects being built in the Belair neighborhood of the earthquake-ravaged city, the tank will use human waste from students at the school, converting it into cooking gas. The project is funded by International Orthodox Christian Charities and carried out by VivaRio, a Brazilian NGO that has been working in Belair for years.