Will natural gas fuel America in the 21st century by J. David Hughes, Post Carbon Institute.
Erratum to the Shell Annual Report 2010, by Friends of the Earth.
Research and Policy Recommendations for Hydraulic Fracturing and Shale‐Gas Extraction by Robert B. Jackson, Brooks Rainey Pearson, Stephen G. Osborn, Nathaniel R. Warner, Avner Vengosh, Duke University, peer-reviewed study.
How unconventional gas threatens our Health, Water and Climate, by DeSmogBlog Society of British Columbia.