Slates from quarries in Wales once went to roof the world. By the late nineteenth century as many as a third of all the roofing slates produced worldwide came from Wales, competing with quarries in France and the United States. This book traces the industry. Ar un adeg byddai llechi o chwareli...

In the past decade, innovations in hydraulic fracturing and horizontal drilling have fueled a boom in the production of natural gas (as well as oil) from geological formations — primarily deep shales — in which hydrocarbon production was previously unprofitable. Impacts on US fossil fuel...