What Causes Hurricanes?

The Coriolis effect is most vividly seen in the spiraling motion of hurricanes. The following video describes the how a hurricane forms and maintains its ferocity.

Note the key points

1. A large patch of warm moist air over the ocean begins to rise
2. At higher elevations the moisture begins to condense releasing heat energy. This heat energy warms the air further intensifying the column of rising air.
3. Surrounding air rushes in to replace the rising air. That air is diverted by the Coriolis effect setting up the spinning motion.
4. The air rushing in is likewise warm and moist. Thus, the hurricane becomes a self sustaining system.
5. Hurricanes move westward across the Atlantic pushed by the overarching effects of the trade winds.

Why are hurricanes expected to intensify as a result of global warming.

Please post questions.