As Clark has pointed out, this is an environmentally fatal solution. You may be right that winter temps are in the 70's during the winter, but thousands or more species of marine life depend on the warm ocean waters of the gulf during the summer. Many fish and crustations, including the spiny lobster, migrate during the summer months from the warm, deep, waters of the GoM and Caribbean Sea to the now warm waters of the coast. Not only would you disrupt their migratory patterns, you would most likely change their whole environment. As the deep waters would be cooler, along with the suface temps.
This plan would probably induce thousands of extinctions throughout the Atlantic tropics and possibly throughout the mid-latitudes, as you are displacing where the naturally heated waters goes; From the gulf stream, up the US east coast and all the way to Europe; Great Britain to be more specific. If you stop this heat transfer you would more then likely(I put it at 90%) cause another ice age. Its happened before, the gulf stream shut down and temperatures plummeted.
Cyclonekiller, you seem to be missing the point. Lower temps will cause less hurricanes, or no hurricanes all; there's no question about it. It's all the other implications that make it unfeasible. Environmentally you would disrupt all of the at Atlantic ocean, if not the whole ocean, costing far more in money, and life, then any hurricane.
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