Charred coffee grounds could make concrete up to 30 percent stronger, scientists in Australia have found.
Their clever recipe could solve multiple problems at once.
Each year, the world produces about 10 billion kilograms (22 billion pounds) of coffee waste, most of which ends up in landfills.
"The disposal of organic waste poses an environmental challenge as it emits large amounts of greenhouse gases, including methane and carbon dioxide, which contribute to climate change," explained RMIT University engineer Rajeev Roychand when the research was first published in 2023.
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