Royal Dutch/Shell has done it again. For the second time in three months, the Anglo-Dutch energy giant has been compelled to downgrade its reserves estimates. The latest revision saw Shell sliver its estimates of "proven' reserves of oil and gas for 2003 by 220 million barrels and by 250 million barrels for 2002. Earlier, in January, it had downgraded one-fifth of its reserves for 2003 amounting to nearly four billion barrels. This cost both the chairperson and vice-chairperson their jobs.