• Drought-driven loss of stabilizing grass cover is the existential climate risk for the Sand Hills — historical episodes (the 1930s Dust Bowl, the medieval mega-droughts) reactivated the dunes, and the projected envelope brings that risk back into the foreground.
• Ogallala Aquifer drawdown (primarily from row-crop agriculture south and west of the ecoregion) is the bigger water-resource stressor than precipitation change alone.
• Garden-relevant: Sand Hills natives (sand cherry, sand bluestem, prairie sandreed, sand lily, native penstemons) are a high-leverage palette for sandy-soil gardens across the Great Plains and beyond.