I just heard Paul Stamets say that soil is around 30% fungal mass, dead and alive, and that makes fungus the greatest repository of carbon in the biosphere. So to sequester a maximum amount of carbon maybe we should be optimizing for fungus rather than trees. Is a forest the best way to do that? Trees do have a lot of surface area for fungal growth. If so maybe we should be selecting kinds of trees to plant based on their fungal friendliness.