April 20, 2010 was one of the worst oil spills in American history. Now that a year has passed, how effective have the clean-up efforts been? And what's being done to prevent similar disasters in the future?
While some regions of the Gulf have recovered significantly, there is still a lot of oil that's accumulated on the bottom of the Gulf. And although President Barack Obama initially had a moratorium on offshore drilling, he lifted it this past fall and Washington has issued a handful of permits for new drilling.
Today, memorials and protests are taking place all over the world to mark the anniversary of the spill...
Check out this exhibit at the Tate museum in Britain, where a naked man lies on the floor as people dressed in black pour oil over his body.