That's all very well, but what happens when a storm comes along and sends bows crashing down onto the pavement below, and what about the collective weight on the structure? Hundreds of saplings weighing a few kilos each will become hundreds/thousands of kilos each in only a decade.
Are you sure it's not just a talking point concept or a April fool's equivalent in another country?
If you travel through the centre of Bangkok which has some of the world's tallest living structures you will often see displays of tree like greenery at huge heights. Mind you Thailand doesn't have the strictest Health & Safety laws so I have no idea if these forests in the skies ever come tumbling down.
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