Not sure if this has been mentioned/seen before, but today while working I was behind a MTS bus painted green with trees and flowers etc.. on 4th and Washington near Scripps Mercy Hospital. Plastered all over was CNG/ELECTRIC HYBRID. I only snapped a picture from the back that i'll post later.
side view: They hit the scene around april of last year. EDIT: Here's the story ~ The $1 million bus will not only improve overall consumption figures, but will also burn a cleaner fuel which, while still producing CO2, reduces NOx pollutants and noise pollution.