Costing the Earth

President Obama described Deepwater Horizon as America's worst environmental disaster. If that was true why have fish numbers in the Gulf massively increased since the blow-out? One year on from the disaster Tom Heap travels through Alabama, Mississippi and Louisiana in search of the true economic and environmental impact of the spill. Did the political and media reaction cause more damage to the region than the accident itself? He'll also be asking what effect the reaction to the disaster could have on Britain's plans for deep water drilling.