100 square kilometers sounds like a big area. And it is, in continental Europe or in an urban area. In Montana, it's enough space for a few hundred cows. In desert regions, it's worth even less. You can buy 100 square kilometres of unserviced desert land for ~$10M.

Even better, get rid of the mandate for ethanol and cover a portion of the ex corn fields with solar panels with native plants under and around them. A small portion of the land that is near existing transmission lines is needed to replace combustion vehicles with electric vehicles. The bulk of the rest of this land could be available for other uses, including data centers.

This gives: sustained income for landowners, CO2 reduction, power for new uses, and partially restored ecosystems that have been greatly harmed by chemical laden monocultures.