Harvest Global Warming

There is an enormous amount of thermal energy stored in the ocean, and the concentration of this energy is growing as global warming increases. The potential effects of global warming are devastating, and have possibly even already been seen directly in recent hurricanes battering the US coast.

I propose to use that energy by building a tall hollow tower/tube mounted on floating oil platform over the ocean, that basically creates an artificial hurricane/cyclone. As the warm air rushes up the tower, it expands, thereby pulling further air up behind it, creating a self sustaining pump. A version of this has been built on land in spain, and one is planned to be built in NSW/Australia. But why not on water over a warm ocean current, such as the one that Hurricane Katrina rode into New Orleans?

To extract energy from this, turbines would be installed at the base of the tower, and the resultant electricity can easily be transmitted along undersea cables to the population centres.

This would have the immediate benefit of reducing the thermal energy load in the ocean, thereby reducing effects of global warming (eg rising ocean levels, and energetic hurricanes).

I think to get a self sustaining system, the air must move at about 100 km/h through the tube (similar to the minimum at a hurricanes core). Through a column 6 metres wide, this would be a flow of about 800 m3/s. Can someone help me calculate how much energy that would allow?

There have been other ideas that I have seen that have proposed to extract energy from hurricanes themselves, but the problem with them, is that hurricanes don't happen very often. Whereas this would be useful all year round.