A sign sits on the exterior of UF De Schilde's urban farm rooftop greenhouse in The Hague, Netherlands, on Tuesday, April 26, 2016. The urban farm is located in a former Royal Philips NV factory, designed by the grandfather of Dutch architect Rem Koolhaas, and houses the largest commercial city facility for food production in Europe. Photographer: Jasper Juinen/Bloomberg via Getty Images
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