Is the point of these technologies to make it seem like we can continue on with our unsustainable lifestyles without making any inconvenient changes?<p>What about the host of other pollutants that come out of vehicle exhausts? What about surface ozone, sulphur dioxide, and soot particles? Maybe we shouldn't be focusing on such remedial technologies that let us believe we can carry on as we are without needing to give things up that are bad for the environment.