Why haven't humans harvested the power of waves yet? How are engineers trying to overcome those difficulties?

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 UnU one  Because wind will always exist, waves will always be available at the surface of the water to generate electricity, making this a renewable source.

Explanation:  I HOPE THIS HELPS

At a meeting of the Institution of Naval Architects, recently held in London, Mr. Scott Russell delivered a very interesting discourse on Railway Communication across Lakes, Straits, and Arms of the Sea. He said that, as they had very olten to cross the English Channel, it was a great act of international cruelty to keep up such a wretched communication between Calais and Dover, as the great British nation and the great French nation now combined to keep up. It was now more than three years since that eminent engineer, Mr. Fowler, became engineer to an association for putting a railway between Dover and Calais; and he (Mr. Scott Russell) was the naval architect for the steamships that were to make this communication. All the Surveys had been made, all the plans had been prepared, and all the preliminary legal steps had been taken for bringing the scheme before the Houses of Parliament. But it was an unlucky period. Rail-Way companies were quarreling with and ruining each other, and a scheme which, merely interested the traveling public could not at that time command successful attention in the legislature or in the community. He might state that the plans had been fully matured. They had provided plans of the works by which railway trains s-ould descend the pier at Dover, go into the vessel, cross ffver to Calais, and go from Calais right on to Paris, and nee tana; so-that a passenger from London would, by a night trsii, take his seat or his bed in a railway carriage at London Bridge, and would open his eyes in the railway station at Paris, unconscious that he had crossed over the sea. That was a conclusion which he dared say people would gladly see realized; -but he could not hold out any prospect of its being speedily realized, because we were such a patient people that it was likely for the next ten or twenty years we should be content to make passage as we had always done. Curiously enough, about a year after this he was invited to look at the inland sea which separates Switzerland from Germany. What the Germans call the Bodensee, and what we call the Lake of Constance, was a great inland fresh-water sea, sixty or seventy miles long, and eight to twelve miles broad. The railways of Germany came close down to the Gorman side of the lake, and the railways of Switzerland came down to the opposite side of the lake : and there the communication between the two countries was as completely interrupted as our communication with the Continent was blocked by the Straits of Dover.

iron would move it is magnetic there is a mag field around the current in the wire

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