How To Stop People From Trashing New Jersey

I saw something yesterday that upset me and now I'm regretting that I didn't do anything about it.  Here's what happened:  I was driving along and came upon a stop light.  The guy in the car in front of me opened his window and threw out a banana peel.  I was kind of dumbfounded that someone would do that in 2016 with all we know about respecting each other and the environment.

Why couldn't the guy wait until he reached a trash can or compost bin?  Is the smell of a banana peel so offensive that he couldn't bear to have it remain in his car until he reached his destination?  I have no answers to any of those questions.

Another question that's on my mind is, "Why didn't I do or say anything?"  I could have gotten over my shock and just gotten out of my car to pick up the peel, all while the light was red.  But I didn't.  I guess there was a part of me that was afraid to do so.  The guy would have seen me and I didn't know how he would have reacted so I probably just played it safe and stayed in my car.  But what's the worst that could have happened?

I did some searching online to see what others in my situation have done.  I learned that in many states, drivers are encouraged to post the license plate of the offender's car as well as date, time, and location of the littering!  There's a site called www.litter-bug.org that encourages the posting of such details and offers and easy to fill out form to do so.

www.stopdumping.nj.gov has a whole section about what to do if you spot piles of trash or know of some illegal dumping going on in New Jersey.

When you encounter someone throwing trash out of a car or improperly disposing of something, do you do or say anything?  Any suggestions as to what I should do the next time I witness littering?