The author believes that any processing industry to consume resources, the key is to consume what kind of resources. The world's natural resources are divided into two types: disposable resources and renewable resources. such as steel, coal, petrochemical, non-ferrous metals, its raw materials are non-renewable disposable resources, while food, cotton, oil, livestock are renewable resources. One day the Earth's disposable resources will eventually dry up, at the rate of exploitation coal is only enough to be mined for 200 to 250 years, and oil will dry up for another 40 years to 50, when there is no petrochemical industry and coal chemical industry, no more plastic and chemical fiber, no fuel cars on the streets.
As a result, human beings have taken various measures to limit the consumption of disposable resources. Tannery industry and flour mills, rice mills, canneries, food factories, consumption is inexhaustible, inexhaustible renewable natural resources-biological resources, as long as human beings also eat meat, drink milk, but also pig, cattle, sheep, tannery raw materials have a steady supply, it will never cause the earth to dry up resources, Only with the reasonable consumption of this kind of resources, drive the cycle, development and promotion of an industrial chain.