Industrialization has led to a separation of humans and livestock from croplands resulting in an imbalance of nutrients that has negative implications for sustainable agriculture.  Although animal manure is a resource that can provide nutrients and organic matter for cropland, the trend towards Concentrated Animal Feeding Operations (CAFOs) results in concentrations of manure and an overloading of nutrients that can negatively impact watersheds.  There are several strategies for maintaining sustainable nutrient balances.  Decreasing nutrients brought onto the farm can be achieved through diet modification and rotational grazing.  On farm management practices such as reducing runoff, timing manure applications and following Best Management Practices can also improve nutrient balance.  Excess nutrients can be reduced by off-farm export to local farmers, increased crop production or decreased animal units.  Encouraging community-based food systems that advocate consumption of locally produce foods and promote sustainable community planning con improve sustainability.