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Several years into the "shale revolution," progress remains confined largely to North America. It is a viable question whether the shale oil and gas business will take off outside North America at all, or just at a slower pace. The reasons for slow growth vary from country to country but center around lack of infrastructure, ownership rights, government and public support, an active service sector that can support the activity, and whether such production makes sense economically. The growth in shale oil over the past few years has been impressive. Unconventional oil production in the Permian Basin, Eagle Ford, and other areas has lifted output in the state of Texas to 2.7 million BOPD.