The Belle Island project is more profoundly isolated. I believe the appeal of it is that they don't have to deal with the rest of the city and can make an easy buck.
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I've even read about possibilities for farming the land which could reestablish some much needed greenbelts in the urban region.
It is very true that the would-be residents of Belle Isle would live mostly on their isolated island, maybe taking the monorail to revitalized downtown to catch a show, or only reside there a fraction of the year for tax purposes. I think the possibility is that the project would be massive ($20 billion?) in terms of construction and there would be a steady stream of construction jobs for probably half a decade, if not longer. Plus, when it is done, there would be some jobs for those who live in Detroit and could commute in, support staff, etc. . .
Detroit has a high murder rate, I think that the only way to really tackle that is to hire more police and increase the prosecution/conviction rate. It used to be in the 1950's that the conviction rate for murder was high, like near 90%. And with the rise of large cities, where people don't know each other as well as they used to, the closure rate is something like 62% nationwide, in Detroit the closure rate is 33-35%.
http://www.examiner.com/article/why-detroit-leads-the-nation-violent-crime
In countries with abysmal closure rates for homicide, like near 10%, you see a whole lot more murders because the bad guys know that they can get away with it. Detroit also has something like 30 arsons a day. There has also been a lot of corruption in Detroit. Don't see the city turning around without more money for police and basic services. If businesses are too afraid to setup shop in Detroit, maybe Belle Isle would be a much needed bastion of peacefulness and jobs for people who are stuck in a really horrible situations.
Agree that the old buildings and empty lots needs to be cleared, and that plants/trees should be put there. I've got a garden, my tomato plant I let go wild puts out about 5 tomatos every couple days for the past 3 months . . . but soil quality is all important, and that includes making sure there aren't contaminates and heavy metals. Is there lead in these old buildings? Asbestos? I'd be kinda hesitant about putting up some planters on a recently cleared lot, unless I could removed the first six inches or so of soil, and build 36" planters filled with quality stuff AND do testing, and only if there wasn't a building there previously.
Are they also going to dig up foundations and test the soil on the lots? I think if they planted trees/shrubs, and mulched, nature would sort of heal itself in a decade or so.
"Phytoremediation" of soil (using plants to absorb and concentrate the bad stuff and sometimes process into a less dangerous form), such as to remove lead/arsenic can be done, and there are other ways to make sure the soil is healthy. If done on a large scale, it would probably be cost effective and efficient.
I only use a compost blend which is tested for heavy metals and certain bacterial contaminants. I personally wouldn't eat anything grown near a gas station (lead),
https://www.boundless.com/biology/p...iation-a-form-of-bioremediation-using-plants/