Oil is toxic for humans, containing many different compounds:

Oil contains a mixture of chemicals. The main ingredients are various hydrocarbons, some of which can cause cancer (eg. the PAHs or polycyclic aromatic hydrocarbons); other hydrocarbons can cause skin and airway irritation. There are also certain volatile hydrocarbons called VOCs (volatile organic compounds) which can cause cancer and neurologic and reproductive harm. Oil also contains traces of heavy metals such as mercury, arsenic and lead.

The oil in the Gulf is also unrefined, unlike the stuff you pour into your car. It also comes from the deepest oil well ever drilled, and it is possible that the chemistry is different at such great depths due to pressure, heat or other factors. So it is hard to tell at this point whether it is more or less toxic than standard, refined oil (Coast Guard chemists have tested the oil, but - to date - no reports have been made public.)

In addition, highly toxic dispersants have been used to try to break up the oil. See thisand this. Not only are dispersants being released underwater, but the air force is also dropping dispersants on the slick from above.

The official information for the dispersant reveals problems:

OSHA requires companies to make Material Safety Data Sheets, or MSDSs, available for any hazardous substances used in a workplace, and the ones for these dispersants both contain versions of a disturbing statement.

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Both data sheets include the warning “human health hazards: acute.” The MSDS for Corexit 9527A [the dispersant apparently being used in the Gulf] states that “excessive exposure may cause central nervous system effects, nausea, vomiting, anesthetic or narcotic effects,” and “repeated or excessive exposure to butoxyethanol [an active ingredient] may cause injury to red blood cells (hemolysis), kidney or the liver.” It adds: “Prolonged and/or repeated exposure through inhalation or extensive skin contact with EGBE [butoxyethanol] may result in damage to the blood and kidneys.”

In the best case scenario, the gusher will have been capped and some cleanup commenced by the time the first hurricane hits the Gulf, the hurricane will be small, and the effects minimal.

In the worst case scenario, a major hurricane could spread toxic compounds inland onto crops. It could also aerosolize and then spread toxic chemicals, causing serious health problems for local residents - especially children, the elderly and those already at risk. (via)

I recently noted after the Gulf of Mexico oil disaster; 

Our world is addicted, dependent on oil. A complex problem. And what are we doing? We make it even more complex.

Here is the support I found (came across) via greenresearch.com in my hypothesis of ‘complexity disaster’ - that by solving a complex problem with complex approaches and not solving the problem itself in its entirety. We don’t get rid of this complex problem plain speaking, delaying the breaking point. We merely make it several orders of magnitude more vulnerable to human error.

Humans are prone to err. Changing only at the precipice of the problem.

“The current news cycle links continuing coverage of the disastrous oil spill in the Gulf of Mexico, whose cause remains uncertain and whose solution so far elusive, with puzzlement about the cause of a recent 1,000-point plunge  in the Dow Jones Industrial Average.

It may appear that these two traumas have nothing in common. Indeed, the havoc in the stock market will prove ephemeral, while the devastation of the Gulf oil spill could be with us for a generation or more. But they are linked by the role technology played in each of them.

As the New York Times noted, the oil drilling platform that exploded and sank in the gulf “was described before the accident as one of the most technologically advanced drilling platforms in the world.” Drilling for oil miles below the earth’s crust and a mile below the sea was once inconceivable. But now it’s a proud triumph of technological advancement. In the case of the stock market plunge, suspicions center on the role of computer-driven flash trading, the esoteric and technologically sophisticated mechanism for making profits by deploying more computing power than one’s competitors in the market.

The common thread joining these two stories is the ability of technology to elude the understanding of its creators, and its power to wreak havoc beyond our control.

It was over two years ago that the $7.2 billion dollar loss inflicted on Societe Generale by a rogue trader evoked for me the Exxon Valdez and the principal that technological sophistication brings power that tends to outpace our ability to understand it and leaves us unprepared for the consequences of its misuse.

It would be a good thing if our technophilic society learned humility from these episodes.”