Though the basics of carbon cycling, including microbial decomposition of soil organic matter and humus, had been established before, Waksman's work clarified the important roles of microbes in the formation and decomposition of soil organic matter. The book is a major milestone in the ongoing discovery of the carbon cycle.
"Humus plays a leading part in the storage of energy of solar origin on the surface of the earth."
Soil Carbon Coalition is a 501(c)3 nonprofit organization