Shale oil extraction Energy estimates that the "ex-situ" processing would be economic at sustained average world oil prices above $54 per barrel and "in-situ" processing would be economic at prices above $35 per barrel. These estimates assume a return rate of 15%. Royal Dutch Shell announced in 2006 that its Shell ICP technology would realize a profit when crude oil prices are higher than $30 per barrel ($190/m), while some technologies at full-scale production assert profitability at oil prices even lower than $20 per barrel ($130/m). To increase the efficiency of oil shale retorting and by this the viability of the shale oil
Barrel bombs in Palestine and Israel Three of the attackers were killed and two taken prisoner [see image right]. Meanwhile, in the oil port of Haifa, where the first barrel bomb had been used in September against the British, Irgun turned the weapon against Arab civilians. On December 30, 1947, Jewish assailants rolled a barrel bomb from the back of a fast moving taxi into a group of Arabs waiting in line to enter an oil refinery where they were employed. The refinery employed Jewish and Arab workers and after the bombing distraught Arabs "went berserk". They killed fellow workers by beating, stabbing and kicking them