Researchers at Washington State University have developed a carbon-negative concrete that is almost as strong as traditional concrete.
The team infused cement with biochar, a type of charcoal made from organic waste, that had been treated with concrete wastewater.
The biochar could absorb up to 23% of its weight in carbon dioxide from the air while retaining a strength comparable to regular cement.
Cement production is responsible for around 8% of global carbon emissions, and the development could significantly reduce emissions. The research was published in Materials Letters.