FWIW Iceland gets about 4 hours of daylight near the winter solstice, not a generous amount to be sure. Still, it reduces the requirement for artificial illumi

FWIW Iceland gets about 4 hours of daylight near the winter solstice, not a generous amount to be sure. Still, it reduces the requirement for artificial illumination, and with "free" energy from geothermal sources it may be practical enough to grow under glass with supplemental LED illumination. Obviously most anywhere in the US will get more winter daylight which should make greenhouse culture easier to pursue. Though I couldn't get the link you gave to cooperate, I have seen examples of cold weather greenhouse installations before, so I know that it can work.