The vast majority of that empty land is either in less ideal climates out in the west or on federal land. See: https://sitn.hms.harvard.edu/wp-content/uploads/

The vast majority of that empty land is either in less ideal climates out in the west or on federal land. See: https://sitn.hms.harvard.edu/wp-content/uploads/2017/12/Fig1.png https://sitn.hms.harvard.edu/wp-content/uploads/2017/12/Fig1...