Petroleum companies have formed an important part of the global economy for the last decade, since petroleum or crude oil has become the world's main fuel source.  Warner has provided consulting services for significant gas and oil projects around the globe including, Liquified Natural Gas - Tiga Plant, Bintulu, Malaysia, Khartoum - Port Sudan Pipeline, Trenching Subcontract -Sudan Shedgum Retro Refinery, Saudi Arabia, the Keystone Pipeline – USA, and Tamoil Refinery in Switzerland.