This report recommends reaching this goal through two parallel efforts: an incrementalThe first approach talks of stuff like "no-till" farming; the second is more utopian. I'm conservative enough to doubt our ability to come up with such a set of farming systems.
approach, in which ongoing endeavors to develop sustainable agricultural techniques
are expanded; and a transformative approach, in which multiple research areas are brought
together to design farming systems that balance the competing demands from the outset.
For contrast see this post at Treehugger. There's discussion of a "sustainability index", but the discussions by the operator of a 4,000 acre vegetable farm focus on doing more with less. "More with less" easily translates to more profitability; the sustainability index could be a proxy for "more with less".