What we know is that, as referred to earlier by Mr. Hardie, in the old days of leaded gasoline.... I can remember when my dad filled the car up, because I am old enough, I loved that smell. It probably affected me, so all of my shortcomings I'm blaming on leaded gasoline.
What we know, however, is that the graph of blood lead levels in North America from the 1970s to now shows them to have gone down dramatically. If you want to say, “It's gone down dramatically, so why are we here today?”, the fact is that for certain population cohorts, especially the newborn, there's a completely opposite graph developing.
What bothers one is that you can get certain sorts of diseases or you can fall and break your arm, but once the prefrontal lobe of the brain is diminished in size, it stays that way, because lead fools it into thinking it's something good. It's not, and it screws up the way the brain develops, and that's the end of it.
If you want to say, “It's only children at age one, so how many of them are there in Canada, and is this a problem we should be dealing with?”, I would say yes, it is.