In the face of continued high oil costs, interest has increased in the possibility of exploiting Jordan's vast oil shale resources, which are estimated to total approximately 40 billion tons, 4 billion tons of which are believed to be recoverable. Jordan's oil shale resources could produce of oil, enabling production of about . The oil shale in Jordan has the fourth largest in the world which currently, there are several companies who are negotiating with the Jordanian government about exploiting the oil shale like Royal Dutch Shell, Petrobras and Eesti Energia.