Harper's Magazine, 248±ÇHenry Mills Alden, Thomas Bucklin Wells, Lee Foster Hartman, Frederick Lewis Allen Harper & Brothers, 1974 |
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... energy source was the food he ate , namely plants and animals . As an energy source , wood was used almost exclusively until about three hundred years ago , when coal started becoming popular . By the middle of the last century , oil ...
... energy source was the food he ate , namely plants and animals . As an energy source , wood was used almost exclusively until about three hundred years ago , when coal started becoming popular . By the middle of the last century , oil ...
109 ÆäÀÌÁö
... energy investment in the original materials , ( 5 ) is a bold step ahead of contemporary hardware , ( 6 ) is not stop gap in character , ( 7 ) has a long life time and will remain practical for many years , ( 8 ) is useful for export ...
... energy investment in the original materials , ( 5 ) is a bold step ahead of contemporary hardware , ( 6 ) is not stop gap in character , ( 7 ) has a long life time and will remain practical for many years , ( 8 ) is useful for export ...
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... energy is the richest re- source on the Earth . Figured at current prices , the solar energy reaching the Earth's surface each day , converted to electricity ( at present - day technological ef- ficiency ) , would be worth about $ 560 ...
... energy is the richest re- source on the Earth . Figured at current prices , the solar energy reaching the Earth's surface each day , converted to electricity ( at present - day technological ef- ficiency ) , would be worth about $ 560 ...
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