Energy Saving
I think that the future will solve the problems with energy consumption, as technology becomes more organic, the 'battery' of life itself will power these kinds of things. Low emmissions due to low loss of heat and noise etc... all the things it seems big business is desperarte to thwart until the bitter end.
Inasmuch as a plant uses the sun for photosynthesis, why can't a bridge use solar energy to repair and monitor itself, particle by particle.
