Stock Photo - A sign reads 'Energy from waste water! Energy plus water recycling' at the water treament station of 'Roof Water-Farm' in Berlin, Germany, 11 June 2014. The pilot project for agriculture and fish breeding is conducting field research amongst other topics into technological options concerning water treatment for irrigation and fertilisation of roof-top greenhouses in buildings and the cultivation of food produce. Photo: Jens Kalaene/dpa | usage worldwide. - Berlin/Berlin/Germany

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