Oil earnings surge but some question skimpy investment

Rising crude prices drove huge profits for US oil industry giants, but key figures in the sector have raised concerns about low investments in exploration and production.As petroleum prices have stabilized over the last year following actions by OPEC, oil companies have ramped up investment in key US shale regions such as the Permian Basin in Texas.The investment restraint "brings an additional cause of concern for global energy security at a time of heightened geopolitical risks in some major p