From the sci-fi end of the spectrum, we have the Icelandic project known as BioDome Reykjavík, which is precisely as futuristic as it sounds. If all goes according to plan, the massive public initiative will create a cluster of domed public plazas and urban farms right in the heart of the Capital region.
Each domed area would maintain a balmy climate warmed by Iceland's famous geothermal energy systems. The largest of the domes will create a subtropical environment in the middle of the city, with exotic plant and animal species. Rather than cover an entire residential village, the biodome structures would provide something more akin to a collective village square, with restaurants, cafes, public meeting spaces and farmer's markets.
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For Reykjavikians looking to duck out of the cold for a bit, it should be a nice option - current plans call for temperatures under the domes to hover at a comfortable 25 degrees Celsius (77 degrees Fahrenheit) year-round. Average Reykjavik temperatures in February? Anywhere from -2 to 3 degrees Celsius. You can do the math from there.