[blam]

"The material wears off the tires,eventually settles on the ground due to gravity and it's own weight,then it rains several times where it returns to the earth from which it came.PROBLEM SOLVED,let's move on to the next thing."

Okay, next problem!

Warning Over Fish Mercury Levels (Heart Attacks)

[ASOC]

How about "what happens to the oil that drips off my car?" as a related issue?
Non-point source oil spills - put more oil in the environment each year than the Exxon Valdez (albeit over a much larger area)
Or how about "Space dust from metorites" or"....well, you get the picture.
Some enviro stuff is important and affects us all (remeber Love Canal?) - some is junk science at best.