Accurate seaweed biomass estimation is a major barrier to scaling marine carbon dioxide removal (mCDR). We propose an innovative, cost-effective method integrating nature inspired solutions with aerial drone imagery with biomass and sediment data to precisely measure daily growth and mCDR. This approach overcomes monitoring challenges, including costs and accuracy, making mCDR scalable, feasible and reliable. Publicly available benchmarks accelerate technology adoption to combat climate change.