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Winner - sustainable cities: Net-zero transition. A photobioreactor at Algalif facilities in Reykjanesbaer, Iceland. Algalif plant produces sustainable astaxanthin from micro-algae using 100% clean geothermal energy. In the starvation phase, the algae culture is exposed to UV light to cause stress conditions and induce astaxanthin synthesis. The proprietary lighting system enables Algalif to reduce overall energy consumption by 50%, in addition to providing for optimal microalgae growth, productivity and yield. (Photo by Simone Tramonte/CIWEM Environmental Photographer of the Year 2021)
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