Answer: using it for range land
Grassland is an ecosystem which is dominated by grasses as herbs, shrubs and other vegetation. Using grassland for range land can be least harmful as a range land is an area of grassland which is used by domestic or wild herbivores for grazing. The grass used by these animals grows again so there is no major loss to the ecosystem. Plowing it for crops will remove the entire naturally growing vegetation. Developing commercial areas will also remove grasses from grassland and will cause the loss of floral and faunal species. Importing foreign animals to use the grasslands as a habitat will result in drought conditions as grasses may wiped out from these regions.