Wait and see
Before starting to exploit shale gas in Europe, we should wait for at least 5 years. Why? To analyze the consequences of such exploitation on the environment. The US are a gigantic experiments lab, and there are already troubling signs coming: for instance, contamination of underground water with methane at short distance of wells is averred in Pennsylvania. So before polluting drinking water, we should think twice. Once we will have messed up it, it will be very hard to go backward.