This was written while the BP oil well was pumping tons of oil into the Gulf of Mexico, and everyone was yelling about how terrible it is that oil companies are polluting the world. I walked by a line of cars waiting to board the ferry … waiting and running.
We all are guilty.

Oil-sucking cars wait/
in line. Polluting motors/
run while the Gulf weeps.

OR
Oil-sucking cars wait/
in line, stopped, their polluting/
motors still running.