Royal Dutch Shell Plc had its debt rating cut to the lowest since Standard & Poor’s began coverage in 1990, and downgrades of several other major European oil and gas companies will probably follow in coming weeks. The long-term credit rating for the world’s third-largest oil producer by market value was reduced one level to A+, the fifth-highest investment grade, from AA-, and was placed on watch for another possible reduction, the ratings agency said in a statement. S&P also assigned a negative rating outlook to BP Plc, Eni SpA, Repsol SA, Statoil ASA and Total SA. Oil has fallen more than 70 percent […]