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Chinese scientists reveal glowing plants that could light cities
(www.euronews.com)
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Even if you do get this to produce appreciable amounts of light, this seems like a really good way to have these plants spread outside of their designated areas and fuck up wildlife even more than our artificial lighting does already.
Given that these plants would need to devote a significant amount of resources to store the energy in order to produce light, I would expect they would be outcompeted by regular plants that aren't wasting their energy in the wild. Selection pressures generally favor efficient use of energy.
Good point.