Tell me what this article says about energy in a few sentences. 

Societies use energy for transportation, manufacturing, illumination, heating and air conditioning, and communication, for industrial, commercial, and domestic purposes. Energy resources may be classified as primary resources, where the resource can be used in substantially its original form, or as secondary resources, where the energy source must be converted into a more conveniently usable form. Non-renewable resources are significantly depleted by human use, whereas renewable resources are produced by ongoing processes that can sustain indefinite human exploitation.

Thousands of people are employed in the energy industry. The conventional industry comprises the petroleum industry, the natural gas industry, the electrical power industry, and the nuclear industry. New energy industries include the renewable energy industry, comprising alternative and sustainable manufacture, distribution, and sale of alternative fuels.
Energy resources, which are primary and secondary resources, are used for heating, manufacturing, transport, and other societal purposes. They're used substantially in their original form and used in converted forms, with non-renewable resources being more depleted by humans than renewable resources are. The energy industry employs thousands of people, such as petroleum, natural gas, electrical power, nuclear energy, and renewable energy workers.