Two months after an explosion on BP's Deepwater Horizon oil rig in the Gulf of Mexico killed 11 people, Panorama's Hilary Andersson tells the story of America's 'greatest environmental disaster.' Dubbed an environmental '9/11' by President Obama, the leak caused by the explosion is still releasing thousands of barrels of crude oil a day into the waters of the Gulf.

Fracking has become a national debate in Britain and it’s one the Government are determined to win. With an estimated 1,300 trillion cubic feet of shale gas lying underneath Britain, just a tenth of which could supply our energy needs for over 40 years, it is seen by many as an opportunity which is too good to miss.But what is the environmental cost?