The Italian tech company PuroSole has developed an innovative way to roast coffee beans with renewable energy. Daniele Tommei is one of the cofounders of PuroSole. “It’s the coffee, not the rotating basket or the air in it that we are heating,” he says. “It’s the coffee itself being heated, the sun’s rays hitting coffee beans, heating them and causing the heating of the air surrounding it. “But, essentially, the warmest part of all of this is the bean itself.”[…]

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