Gas: Too much of a good thing?

Over the past five years, the US shale gas boom has brought about dramatic changes in the North American energy landscape, prompting economic and environmental debate in Europe and other parts of the world. In the US, energy prices have fallen dramatically, helping drive economic recovery from the global recession. But the spread of hydraulic fracturing or “fracking” – the technology used to drill for shale gas – has raised the ire of environmentalists.