When an offshore oil rig is outdated, or can no longer cost-effectively pump oil, most countries require that the oil rigs be wholly decommissioned.

FORBES: Environmental Scientists Urge That Decommissioned Oil Rigs Be Transformed Into Artificial Reefs

Private equity backed 2Co wants to build a new coal plant above the Hatfield coal mine and pump the gas to North Sea oil fields where it can be used for enhanced oil recovery.

BBC: Carbon dioxide from industry could be buried offshore

Too many wells release the natural pressure in the field, like fizz from a soda can, and it becomes too expensive to pump the oil out.

FORBES: The YouTube Solution

One danger is that, as the oil slowly oozes out, it might leak into the ground water before a drilling rig can pump it out.

NPR: Industry Seeks to Extract Oil from Rocky Mountain Shale

Not until they ignore environmentalists and allow market forces to work unmolested can oil suppliers act upon the signal that high prices send to their industry pump, refine and deliver more.

ECONOMIST: Dealing with jihadists