I admit I didn’t know much about biochar until recently. You create biochar when burning wood (and other plants) in low-oxygen environments. So what do you do with it? That’s where it gets exciting. The answer is a lot, and it still traps carbon while it’s doing it.
You can mix it in with concrete. You can use it in plastics. You can create a strong industrial composite material from it. You can make ink from it. You can make coffee cup lids. You can use it as a soil amendment. You can use the gas by-product from making biochar in the same way as natural gas.
Source: https://www.rit.edu/sustainabilityinstitute/blog/what-biochar-and-how-it-made