Biochar is a climate change solution
As plants grow, they remove carbon from the atmosphere. As plant matter decomposes, carbon cycles back into the atmosphere. If, however, plant-based materials are instead pyrolised—if they are heated in the absence of oxygen—then the carbon is instead transformed into a stable form of mineral carbon: Biochar. Biochar strongly resists the decomposition processes that re-cycle carbon back into the atmosphere.
If long-term carbon sequestration was biochar's only benefit, then the urgency to mitigate climate change would be, in itself, sufficient reason to make as much biochar as possible.