For half the year, the temperature on Pall Olafsson's remote farm in Iceland often dips below freezing and the sun barely makes an appearance.
Yet the heat and light in his greenhouses allow Olafsson to grow his juicy tomatoes and cucumbers even in the depths of winter – thanks largely to the geothermal energy that gives his tiny North Atlantic nation its title, the Land of Fire and Ice.
"When we started using the lights and growing all year round, then it changed a lot," said Olafsson as workers busily pruned plants behind him.