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In 1877 Donald Mackenzie proposed the creation of a Sahara Sea. He argued that much of the desert of central Tunisia and southern Algeria was beneath sea level, so a canal dug from the Mediterranean to these places would flood them and create an inland sea, with consequent improvement to the climate both locally and in Europe.
Jules Verne's L'Invasion de la Mer (1905) discussed this idea, albeit showing it as an example of human arrogance.
Question: Suppose this canal had been dug and the desert flooded?