1. Bioluminescent Trees
By inserting bacterial luminescence genes into model plants like Arabidopsis, scientists have created poplar trees that glow faintly at night. Early experiments reported in Nature achieved soft green illumination lasting several hours. Imagine sidewalks lit by living trees rather than electric lamps.
Although the current glow is dim, advances in gene regulation and metabolic engineering could boost brightness. If implemented along streets, these bioluminescent trees might cut urban lighting energy use, creating safer, greener neighborhoods while reducing carbon emissions.