Sewer lines aren't sexy!
You can only do that for so long too. You can't go for a boat ride out of L.A. without dodging turds every 50'.
They are not doing it forever. They are doing it for a couple of days.
The has nothing to do with anyone's sensse of ecology and everything to do with Quebec-hate.
P.S. You can't walk down a street in L.A. without running into turds.