Guardian: Ninety oil workers have been evacuated from a North Sea rig as engineers fight to control a huge build up of pressure in a well which critics say has the potential to blow-up the platform and cause a major environmental problem. The Norwegian company Statoil has been pumping cement into an offshore well on the Gullfaks field in an operation similar to the one being attempted today by BP in the Gulf of Mexico. The equivalent of around 70,000 barrels of oil a day of production …