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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: have been the end of our world one fine day!"
"There is no fear of that now, Mr. Starr. But yet, the mines will
be exhausted, no doubt, and more rapidly than the statistics make out!"
"That will happen, Harry; and in my opinion England is very
wrong in exchanging her fuel for the gold of other nations!
I know well," added the engineer, "that neither hydraulics nor
electricity has yet shown all they can do, and that some day
these two forces will be more completely
utilized. But no matter! Coal is of a very practical use,
and lends itself easily to the various wants of industry.
Unfortunately man cannot produce it at will. Though our external
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