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At the Sustainable Agriculture conference this week a guest speaker showed a photo of a northern greenhouse with year around production. To prepare the area, digging four feet down with a backfilling of sand allowed for thermal storage. In non-permafrost land, possibly creating intentional heat sinks by plowing heat into the ground with radiator finned tubing connected to vacuum tubed solar panels or passive solar absorption boxes with ducting into the ground may provide radiating heat needed for early starts. Testing would be need to see how efficient this type of heat would be and how productive it might be.