I found this article very interesting. I think that turning cow manure into something useful is very resorceful. I read through all the given information. Many pros and cons are discussed. I found that most of the cons weren't caused by the digesters or their products but more the only problems they didn't solve. For example, its doesn't stop the runoff caused water pollution, but later they say it can help decrease it. I think, if water pollution is going to be there either way just choose the side with more benefits, which from this article seems to be using the digesters. Another con was that digesters are only good for large farms, more than 400 cows. If that's so then only the larger farm should use them. Over all there seems to be way more pros than cons, especially with cons that hold no water.
Here's the link to the article:
http://www.bayjournal.com/article.cfm?article=4297
