After I had already commented on this article: http://news.nationalgeographic.com/news/energy/2014/03/140319-5-technologies-for-greener-fracking/#, a call went out from a fracktivist blogger that we should also blog our comments, so here is mine:
No fossil fuel can be green. Period. All of the things that are in this article have been around for several years and get trotted out by the industry to try to give themselves cover, but they are not widely implemented and some of them are not widely implementable. Fracking with gelled propane is not only more expensive, it is also much more dangerous and cannot be used close to people because of the explosion hazard. Most of the methane that leaks is not from the wells, although some is, but from processing and underground pipelines. The horrible explosion in NYC recently highlights the deplorable state of methane infrastructure in the US. The only green choice is to stop going after unconventional fossil fuels and use remaining conventional sources as we move to renewable energy sources as quickly as possible.