As you may know, shale gas is becoming the gas revolution of the 21st century. However, a handful of scientific independent studies have been done in the USA, but very little is known in other places.
Hello! Perhaps the following 158 page Final Report prepared by AEA Technology for the European Commission DG CLIMA in 2012 might be of some interest to you:
Climate Impact of Potential Shale Gas Production in the EU (AEA Final Report, 30/7/2012)