One hectare of soil can hold up to 5 tons of animal life
"billions of microorganisms are present in just a gram of dirt, while one hectare [roughly 2.5 acres] can hold up to five tons of animal life." p.8
"In France, it is estimated that some 6,000 km2 is lost to urbanization every seven to ten years...'Disneyland, for instance, is located on the country's best [farm] lands.'"
Carolyn Lebel, “Living Soil: The Lessons we can learn from France's fertile Farmland,” UTNE Reader no. 175 (Jan-Feb 2013): 8.