The National Geographic Magazine, Volume 149, Issue 3National Geographic Society., 1976 - Geography |
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Page 389
... costs should drop significantly within three to five years . And when home- owners average initial costs over the lifetime of a solar installation , solar energy can com- pete economically with other kinds of energy . In several ...
... costs should drop significantly within three to five years . And when home- owners average initial costs over the lifetime of a solar installation , solar energy can com- pete economically with other kinds of energy . In several ...
Page 395
... cost to as low as $ 20 a watt on earth . The ribbon process aims for 50 cents a watt . But many experts predict that solar - cell costs will spiral downward to a competitive $ 500 a kilowatt or less in the next ten years . And ...
... cost to as low as $ 20 a watt on earth . The ribbon process aims for 50 cents a watt . But many experts predict that solar - cell costs will spiral downward to a competitive $ 500 a kilowatt or less in the next ten years . And ...
Page 397
... cost of NASA's Project Apollo moon program - or about 10 to 20 percent of what conventional power - plant costs would be in the U. S. during the next 25 years . O'Neill is no wild - eyed dreamer . He is the respected inventor of the ...
... cost of NASA's Project Apollo moon program - or about 10 to 20 percent of what conventional power - plant costs would be in the U. S. during the next 25 years . O'Neill is no wild - eyed dreamer . He is the respected inventor of the ...
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American Bartlett beautiful become bell boys Brand buildings built called callosities Canterbury cathedral century changes charges Church coast collection collectors College color cost course cover designed drive electricity Elymians energy engineering face feet female frost future give glass Grades half hand heat Indiana island Italy king land less light live look miles mother mountain NATIONAL GEOGRAPHIC nature nearly Norman offer once Palermo Patagonian Photographs plant produced right whales Roger says School seen serve Sicilian Sicily side society solar solar energy South southern stands stone summer surface things town uplands wall wildlife wind winter wood Write