“I’m the most boring person to sit next to at dinner parties,” Arthur Kay jokes about his obsession with waste. Specifically, he’s interested in coffee waste. The 25-year-old entrepreneur started a company that turns leftover coffee grounds from thousands of UK coffee shops into fuel to power homes, offices, airports, and factories. His London-based company Bio-bean takes the grounds thrown away after making cappuccinos and flat whites, and processes them into bio-mass pellets which are mainly used for powering industrial boilers in large buildings. Coffee has a higher calorific value than wood, so releases more energy, he explains. The pellets are carbon...
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