Good spotting, I had not looked through them. Some of the comments are interesting, but a lot of them seem to be more ideological than factual. And some of the factual ones seem to miss the point a bit. I did find what *looks* like a decent wikipedia entry on the environmental impact. I haven't tried to verify it yet, but it seems to be in line with what I have read elsewhere. It seems to agree about the C02 costs of shale gas being roughly the same as coal and raises an intersting point about the impact of the amount of water needed and the needing of lowering surrounding water levels that can have a local impact on forest.
no subject
http://en.wikipedia.org/wiki/Environmental_impact_of_the_oil_shale_industry