. "In these embodiments, the concentration of bacteria in the subterranean brine may be 1???105 cfu/ml or greater, such as 5???105 cfu/ml or greater, such as 1???106 cfu/ml or greater, such as 5???106 cfu/ml or greater, such as 8???106 cfu/ml or greater, including 1???107 cfu/ml or greater." . . . .