This project will demonstrate use of a mobile flame-cap kiln processing kit containing specialized portable metal kilns, known as “Ring of Fire” kilns, to process forest slash onsite. This process results in a “carbon negative” action by returning the elemental carbon (“biochar”) generated through kiln pyrolysis to the soil—either within the forest from which it was harvested or on nearby farms. Importantly, this process can also significantly reduce smoke pollution and PM 2.5 emissions compared to use of open burn piles. These kilns and other similar flame-cap kilns can be manufactured inexpensively and are a replicable and open source technology that can be used at multiple scales.