Converting beach-cast seagrass wrack into biochar: A climate-friendly solution to a coastal problem

• Accumulation of seagrass wrack on beaches has become a global disposal challenge.
• We explore the feasibility of converting seagrass wrack into biochar via pyrolysis.
• Biocharring offsets CO2 emissions and creates a commercially-valuable byproduct.
• Wrack carbon was converted into biochar with an efficiency of 48–57%.