According to sustainable economics: We must recognize that all the factors that go into productionnatural resources, capital, and labor ultimately originate in the productive capacity of the earth. The entire classical model will prove unstable if all the factors that go into production exceed the earth's capacity to absorb the wastes and by-products of this production. We need to develop an economic system that uses resources only at a rate that can be sustained over the long term and one that recycles or reuses both the by-products of the production process and the products themselves. All of the above