 The most important sustainability fact about bismuth is its byproduct status , which can either improve sustainability ( i.e. , vanadium or manganese nodules ) or , for bismuth from lead ore , constrain it ; bismuth is constrained . The extent that the constraint on bismuth can be ameliorated or not is going to be tested by the future of the lead storage battery , since 90 % of the world market for lead is in storage batteries for gasoline or diesel @-@ powered motor vehicles . 
