But a recently published survey of the various conflicting engineering studies comes up with a plausible compromise estimate: Every unit of energy that goes into making ethanol from corn produces ethanol that yields 1.27 units of energy.

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The antenna issue seemed to be a situation of Jobs unwillingness to compromise on looks and style for better engineering.

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And unions representing the 5, 500 strong workforce have said the consortium is considering further job cuts, which could affect engineering staff, who maintain the radars and computers, which may compromise safety.

BBC: Nats privatisation 'financially flawed'