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The gulf stream is the ocean current that is active throughout the Atlantic Ocean and has kept northwestern Europe warmer than other lands of comparable latitude and has encouraged the development of civilization there. Changing global climatic conditions threaten the stable continuation of the Gulf Stream with far-reaching implications for human settlement. The water of the oceans continually circulates in response to tidal and geological processes. One major system, which gives rise to the Gulf Stream, is produced by the westward movement of water caused by the trade winds that drive water at up to four miles per hour through Florida in the United States and then northwards past the Bahamas.

This flow of water forms a kind of barrier or border between bodies of water ...

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