We could be producing concrete that's 30 percent stronger by processing and adding charred coffee grounds to the mix, researchers in Australia have discovered. Their new recipe could solve multiple problems at the same time. Every year the world produces a staggering 10 billion kilograms of coffee waste globally. Most 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," explains RMIT University engineer Rajeev Roychand. With a booming construction market globally, there's also an ever increasing demand for...