Thanks for the comments y'all...you made me feel better of myself...I was feeling like a negligent asshole but now I feel better...and next time, I don't think I will hesitate..
A while back this organization gave citizens these cards so that they could write down the tag number, offense, location. The police would send the offenders a warning. I also heard about this 1800litterbug number, but don't know if it covers everywhere.FYI - http://litter-bug.org/
Stop worrying about litering and polution and global warming. Technology is advancing so fast that, within our lifetimes, you will see microbial drones designed to eradicate polutants from the entire earth. Problem solved. We already have rudiments of this technology, like the microbes used to help clean up the latest Gulf oil spill, or the new filters that can eliminate the flu virus from the air. And these are just the tip of the iceberg. If I had the energy, I could probably dig up a dozen or more articles, just from the last couple years, in which some harmful contaminant is being filtered or converted or otherwise neutralized by new technology.
Global warming will never become a major threat, and pretty soon we'll have a bunch of microscopic Wall-E's swarming around cleaning up our junk. So, like I said, stop worrying about it. Focus on more important things, like making that technology happen faster.