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Interesting and technically informative. Around minute 29 begins Sorensen's discussion of CO2 as a working fluid and how small and efficient they are relative to steam. "Sweet spot" at 500 to 650 degrees C. Dense fluid very size efficient, does not need superheating to reach high efficiency. Efficiency already at 45%, well above the best steam at 35 to 40%. No cooling water required. Many other points Sorensen makes. This happens to be his reason for shifting from anti-nuclear to pro, in the interests of saving the biosphere. Take notes, lots of engineering, Sorensen formerly with NASA.