Clearly, it's not a terribly practical move for providing all locally grown ingredients. More than anything, it is a small experiment and statement to show that sustainable, fresh food can be created just about anywhere...even if it's in micro-amounts. And sitting around watching lettuce grow can actually make a Subway a slightly more appetizing place to eat.
Other similar ultra-fresh vegetable options are being explored through Subway Yasai Lab, so maybe soon alongside the lettuce, we'll see hydroponic tomatoes and cucumbers?
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The project is still in its infant stage, but sometimes the most interesting part of progress is watching it grow. Check out the original post on Treehugger. Image courtesy of Treehugger via InventorSpot.