Growing a meat alternative on Bangkok’s rooftops

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Urban farming can be a source of fresh and sustainable food even in some of the world’s most polluted cities. EnerGaia, a Thai company that works with hotels, businesses and other building owners, is using previously unused rooftops to produce spirulina, an edible cyanobacteria which, if harvested on a large scale, could be used as a high-protein, sustainable alternative to meat.