In response to Jim Nieman (Your Views, April 23): The Keystone XL pipeline is not a win-win. Canada’s tar sands represent a filthy, nasty sludge. Should there ever be an accident, it would be a nightmare to deal with. Employment of individuals would be minuscule once the pipeline is completed. It wouldn’t benefit the United States as far as oil prices or oil availability. This pipeline is a lose-lose prospect.