In this episode, Dr. Tom Cowan speaks with longtime friend Christopher Gardner, who shares his journey of discovering and working with biochar, a potent soil amendment derived from biomass through pyrolysis (low-oxygen burning). Originally inspired by Amazonian agricultural techniques (terra preta), Christopher began experimenting with biochar while living in Central America, where the soil was poor and depleted. Through firsthand trial and error, he found that adding biochar to his farm dram...