Not the sort of amount you'd want to lose down the back of the sofa.
Shell's proposals to decommission its four Brent platforms are a test case for North Sea industry. But here's why decommissioning is not what it's cracked up to be.
President Obama used an obscure 1953 law to bar offshore drilling in Arctic Alaska and along the Atlantic coast. Republicans and energy companies want to reverse the ban, but it will not be easy.
The case for dismantling and recycling oil rigs is far from clear cut.
Nigeria must work together with its people to help keep the peace in the Niger Delta.
Shell has abandoned oil exploration offshore Alaska for now but a variety of trends are driving the energy industry to take a fresh look at Arctic drilling.