I had a similar thought. My initial instinct was that Detroit needs all the jobs and economic activity that it can get. After all, even though the jobs are not that significant in the grand scheme of things, we all want to see Detroit's property being used for some kind of profitable purpose. At the same time, given that more than a tenth of city residents live in this area, is it worth it continue to allow increasing amounts of polluting heavy industry? I do not think the answer is clear, but there are definitely important issues to address.