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Once, the earth was cast half in shadow. Then came fire, candle, and light bulb, gradually drawing back the curtain of darkness. But a brighter world has its drawbacks. An estimated 30 percent of outdoor lighting―plus even some indoor lighting―is wasted. Inefficient lighting costs U.S. ...
not know how the first fire was(1).Early fires on the earth were certainly caused by nature,not by Man,some were caused by lightning in a storm;(2),perhaps,by the hot material which came out of a volcano.Quite possibly,at times,the heat of the sun set light(3)some dry grass or ...
Once, the earth was cast half in shadow. Then came fire, candle, and light bulb, gradually drawing back the curtain of darkness. But a brighter world has its drawbacks. An estimated 30 percent of outdoor lighting―plus even some indoor lighting―is wasted. Inefficient lighting costs U.S. ...