From the research I found, I could not find specific country comparisons, however Professor Dickson Despommier of Columbia University, who is investing in vertical farming, notes the following in relation to countries focused on this concept:
“What is meant by vertical farming? Farming indoors is not a new concept, per se, as greenhouse-based agriculture has been in existence for some time. Numerous commercially viable crops (e.g., strawberries, tomatoes, peppers, cucumbers, herbs, and spices) have seen their way to the world’s supermarkets in ever increasing amounts over the last 15 years. Most of these operations are small when compared to factory farms, but unlike their outdoor counterparts, these facilities can produce crops year-round. Japan, Scandinavia, New Zealand, the United States, and Canada have thriving greenhouse industries. As far as is known, none have been constructed as multi-story buildings. Other food items that have been commercialized by indoor farming include freshwater fishes (e.g., tilapia, trout, stripped bass), and a wide variety of crustaceans and mollusks (e.g., shrimp, crayfish, mussels).
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