$VGPR might be one to look at, just got a deal at the end of March to distribute their "BioChar" in Alaska, specifically with cannabis growers in mind. Biochar is a highly absorbent specially designed charcoal-type product primarily used as a soil enhancement for the agricultural industry to significantly increase crop yields. Biochar offers a powerfully simple solution to some of today’s most urgent environmental concerns. The production of Biochar for carbon sequestration in the soil is a carbon-negative process.