End of September 2015, the Joint International EU-COST and ANS e.V. Biochar Symposium was hosted Hochschule Geisenheim University which was visited by roughly 190 researchers, partitioners and stakeholders from Europe and overseas. "Biochar" is a recalcitrant form of biogenic carbon that can be used to sequester ("lock up") atmospheric CO2 that has formerly been fixed by photosynthesis into biomass as carbon (C), with the general idea to use this "recycled atmospheric carbon" for beneficial environmental and agricultural purposes. Biochar can be produced by modern clean pyrolysis techniques from a range of biogenic feedstock materials such as greenwaste, greenhouse residue, grape and fruit tree wood and prunings, wood-chip sievings, grain husks, paper fiber sludge, nut shells, digestate and so on; it may be called "charcoal" if the feedstock is pure wood. In modern pyrolysis techniques the generated heat and oil can be used to substitute fossil fuels. Another technique, hydrothermal carbonization, was also touched as a conference subject, mainly for P recycling from waste streams such as sludge.

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