All those spooky decaying things and the wiggly worms that live in them are all part of natural soil and help make the new plants grow. Biochar would have been decaying plant matter. Instead, as biochar it traps CO2 and aids soil structure. Soil is made up of minerals, soil organic matter, living organisms, gas, and water. Plant, animal, and microbial remains in various stages of decomposition make up soil organic matter. It's the most important indicator of soil quality. So, they may seem like dead and decaying gloom, but it is what makes the flowers bloom! When you add biochar to the soil mixture, with compost you make a nice dark mansion for them to live in.