(Bloomberg) The world’s leading emerging market powers have complained for years about being sidelined by wealthy nations. Now they are mounting their most ambitious challenge yet to the status quo. Most Read from BloombergBorrowers With $39 Billion in Student Loans Finally See ReliefPutin Turns to Ruble and Ballot to Shore Up Shaken AuthorityRolls-Royce Debuts Droptail Roadster, Priced at Over $30 MillionBond Bulls at JPMorgan, Allianz Double Down on Bet Gone BadThe BRICS bloc — Brazil, Russ