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The article looks at the development of unconventional petroleum resources in the U.S. such as shale oil and gas as of 2014, focusing on environmental concerns. The author outlines environmental damages to both air and water from shale oil and gas production, noting that hydraulic fracturing, or fracking, is not the only element of the process that has raised environmental concerns. He also notes that shale gas production can release the greenhouse gas methane in significant quantities including through leaks, contributing to climate change. He discusses technologies for reducing methane emissions from gas wells. Topics include Colorado's oil and gas production regulations and the impact of the surge in U.S. petroleum production on the development of renewable energy sources.
