Growing the blue-green algae spirulina, an increasingly popular “superfood,” doesn’t just yield a nutritious dietary supplement. It also combats climate change and, due to advances in the way it’s produced, can give individuals with limited resources a new way to generate income.

“Spirulina is packed with protein, vitamins, and minerals, and can make a real impact on food security and sustainability,” says Saumil Shah, the founder of EnerGaia, a company that grows the microalgae in...

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