Natural Model: the Cow
Nature operates under the condition of limited and finite resources. It therefore reuses, recycles, rebuilds everything it needs to sustain life.
One organism’s waste is another’s food or building material. ~ The Way Life Works [1]
(Photo credit) The cow grazes on a field of grass. The grass gives it nutrition, energy and sugar to grow. Everything the cow eats eventually lands back in the grass, where bacteria turns that material back into soil. With the help of earthworms, air and water can penetrate the soil and allow new grass to grow [1].













