Weird Light
 

I've owned my current Cobalt (2010 2-door coupe) for 6 months now. Recently we had a snow and as I was going out to my car I noticed a weird greenish glow on the snow coming from the underside of the bumper. There is some sort of green light under there that is apparently on all the time. When I turn the car off it blinks several times, but always seems to be on. Any idea what this may be for? There doesn't seem to be anything in the manual about it.

Were you watching the X-Files before going out? (Sorry, had to do it)