My smile disappeared as I pored over the attached spreadsheet. Food production Earthside continued to drop as the climate deteriorated. The pounding that the planet had taken during the war was sending Earth into an ice age. As the glaciers advanced and snow accumulated farther and farther from the poles, arable land became tundra, then tundra became ice. We had to balance food production with moving higher-latitude enclaves into more equatorial locations. Homer’s space-based farms were taking a lot of the pressure off. As each farm donut was spun up and began producing crops, we were able to move Estimated Time of Habitable Earth Remaining later by a couple of years. The farm donuts were Homer’s idea, and he ran them like a military operation.