As U.S. crude oil stockpiles soar, CME Group Inc. has come up with an innovative way for energy producers to reserve space in storage facilities. The ability to trade oil futures contracts has been around since 1983, but on Monday, the first ever oil-storage futures contract goes live. One contract bestows upon its holder the right, but not the obligation, to store 1,000 barrels of crude oil in caverns or above-ground tanks in Louisiana. Three grades of sour crude are eligible to be held at these facilities, which are connected to 50 per cent of the United States’ refining capacity...