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At 2150 GMT a year ago today, the Deepwater Horizon drilling rig exploded 50 miles off the coast of Louisiana. The blast killed 11 workers and set in train the biggest oil disaster in American history.

Business Daily has joined forces with the World Service'S science unit to explore the aftermath of the Gulf of Mexico oil spill. What have the long term consequences been and what lessons can be learnt from the events of the 20 of April 2010?

Jon Stewart reports from New Orleans on the environmental impact of the disaster. He speaks to fish sellers, crabbers and other affected by the disaster.

Many environmentalists have argued that the Deepwater Horizon disaster revealed just how risky deep water drilling is and have said that it should lead to a fundamental reassessment of energy policy not just in America but around the world.

So will the spill lead to significant changes in policy? Justin Rowlatt spoke to John Hofmeister, the former president of one of the world's biggest oil companies Shell Oil, and the Oxford energy economist Dieter Helm.

Plus, will it take a miracle for New Orleans to recover from the combined effects of Deepwater Horizon and hurricane Katrina? Justin Rowlatt interviews Michael Hecht, of Greater New Orleans Inc, who is the the man charged with rejuvenating the region's economy.