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Staff check the algae bioreactor at a pilot plant at CLEARAS Water Recovery headquarters in Missoula, Montana, United States, on 21 October 2019. The plant cleans wastewater by using algae to filter out nitrogen, phosphorus and other chemicals. The resulting algae biomass is recycled for further use, such as in bioplastic shoe soles. (Luca Locatelli, for National Geographic) NO SALES, THIS MATERIAL IS FOR SINGLE USE PUBLICATIONS IN PRINT OR FOR A TEMPORARY ONLINE PUBLICATION, AND MAY BE USED EXCLUSIVELY TO PUBLICIZE THE 2020 WORLD PRESS CONTEST AND EXHIBITION. IT MAY NOT BE PUBLISHED AS PART OF AN ARTICLE OR ANY OTHER ITEM THAT CONTAINS NO DIRECT LINK TO WORLD PRESS PHOTO AND ITS ACTIVITIES. THE PICTURE MAY NOT BE CROPPED OR MANIPULATED IN ANY WAY. KEYSTONE PROVIDES ACCESS TO THIS PUBLICLY DISTRIBUTED HANDOUT PHOTO. THE COPYRIGHT IS OWNED BY A THIRD PARTY.