Dr. Johnson lives in a self-constructed stonehouse in northeastern Arizona up on the Little Colorado Plateau near Kykotsmovi Village, about a 90-minute drive from Flagstaff. This area is a semi-arid environment, receiving six to 10 inches of annual rainfall a year, which isn't much. While conventional crop scientists insist that a farmer needs over 30 inches of annual rainfall a year to grow corn, Hopi dryland farming challenges this assertion. Hopi farming techniques are designed to conserve as much soil moisture as possible. For thousands of years, Hopi farmers have grown corn, beans, and squash in this harsh environment, and Dr. Johnson is working to ensure that Hopi dry farming traditions continue.
Solving world hunger, improving banana access... In practice, it's largely the same thing. But yeah, if there were crops that grew well year-round in Iceland, then that would be great. But if that were the case, then they probably wouldn't be building geothermal banana greenhouses in the first place.