Stabilizing the climate requires less CO2 emissions and ways to extract carbon from the atmosphere. Carbon sequestration describes long-term storage of carbon dioxide or other forms of carbon. Carbon is naturally captured by the biosphere and stored in biomass. This is part of the Earth’s ecosystem services. Most biomass degrades and releases the carbon back into the atmosphere. Producing biochar from agricultural biomass waste, using a process called pyrolysis, is a way to fix the carbon stored in the biomass into a more stable form. How can the concepts of ecosystem services be integrated with processes of sequestering carbon from the atmosphere and integrating it into the soil? How can we reliably measure the elemental carbon sequestered from the weighted biochar?