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Well human labor is a somewhat renewable source of energy. And when people perform work for us it saves us the energy of performing the same work ourselves in the future. And when people perform work to produce artifacts such as planted crops, structures, machines, buildings, materials, working inventory the work is stored in physically observable material capital held on land. If we want to coin the material capital and place a shared currency into circulation backed by material capital this can be accomplished by having public employees of local land loan offices appraise the minimum labor replacement cost of the material capital which the borrow agrees to hold on site and require the loan to be repaid before the capital fully depreciates.