When the population is very. Needs to consume more. There are many factories making chuen to human needs. The machines used in the factory to use oil as a fuel voucher. Do not waste energy can be a substitute.
As the population has very The demand for more goods. There are many factories making tanks. To meet human needs Machinery used in oil-fired plant matter. Consumes energy that can not be substituted.
When the population is much, needs to consume more. The factory has มากชึ on. To meet the needs of human beings. Machinery used in the plant oil as fuel.