Gulf oil disaster:

May take years to recover

As BP works to finally kill its runaway well and anxious coastal residents breathe a sigh of relief, experts warn it could take years - or even decades - for the Gulf of Mexico to recover.

Three weeks after the flow was fully stemmed with a temporary cap, the massive slick which once spread for hundreds of miles has been mostly dissolved or dispersed.

Nightmare scenarios in which tens of thousands of birds were smothered to death by blankets of oil proved unfounded after the bulk of the slick stayed offshore. Fishermen who feared their way of life was destroyed are being allowed back into most waters.

"There's essentially no skimmable oil left on the surface," Doug Suttles, BP's chief operating officer, told reporters Friday.

"Things have improved quite dramatically and that's a combination of the work we've done and Mother Nature." But while Suttles appeared relieved that the well was finally plugged and should be officially "killed" in a matter of days, he cautioned that "we're far from finished."

Hundreds of miles of Louisiana's fragile coastal wetlands remain coated with sticky sludge and each tide carries fresh tar balls onto once-pristine beaches as far away as Florida.

Vast quantities of oil remain hidden below the waves, suspended in the water column in droplets which remain toxic to the fish and other marine life which once supported a multibillion dollar commercial and recreational fishing industry.

The good news is that the oil appears to be biodegrading rapidly.

The problem is that there is simply so very much out there.

It took 87 days to fully cap the well in the wake of a devastating explosion on April 20 that killed 11 workers and sank the BP-leased Deepwater Horizon rig, unleashing a torrent of oil into the Gulf.

In that time, 4.1 million barrels of oil escaped into the sea: enough to fill 260 Olympic-sized pools and make this one of the world's worst spills on record.

Just eight percent of the oil was removed from the sea by skimmers and controlled burns.

A government report issued last week estimates that another 42 percent is essentially "gone" thanks the heavy use of chemical dispersants and natural processes like evaporation and the microbes which feed on hydrocarbons.

"This whole notion that that stuff is weathering away is really questionable," said Jim Cowan, a professor in Louisiana State University's department of oceanography and coastal sciences.

AFP