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"True sustainability" is the line of engineering research and practice that is giving rise to a series of Scrivener textbooks, such as Khan & Islam's best-selling The Greening of Petroleum Operations . Making explicit reference to his own recently-published book in this series, Sustainable Energy Pricing, as the companion volume of this book, the author applies the principles of true economic sustainability developed there to re-examine actual engineering practices in fossil fuel and as well as alternative-energy (such as wind and tidal power) exploration and development.