Let's recall, the Stone Age ended not because coal ran out on the Earth

Energy saving - the factor of ecological and economical security
During its evolution the mankind shows a proof growth of energy consuming. Rough calculations for an average world expenses of all kinds of energy for one person during the different periods of a civilization are such: the Stone Age - 15 thousand kilojoule/24 hours; a feudal society - 45 thousand kilojoule; an industrial society - 300 thousand kilojoule; a postindustrial society - up to 1 million kilojoule/24 hours. So, a simple calculations show, that every day we consume 66 times more energy, than our ancestors from a paleolith.

Mykhaylo KRASNYANS'KYI