As the world searches for better ways to manage waste biomass and clean up polluted environments, a growing body of research is focusing on biochar, a carbon-rich material made by heating organic waste in low-oxygen conditions. A new review published in Biochar offers a comprehensive comparison of conventional pyrolysis and microwave-assisted pyrolysis, two major routes for producing biochar, and explains how the choice of heating method can shape biochar’s structure, chemistry, and pollution-removal performance.