It might be that some change in a technology somewhere has made producing that technology more profitable.

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Mr. FOODY: Somewhere between 50 and 100 billion gallons a year of cellulose ethanol could be made in the United States, just from the available resources.

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It was only many years later in 1989, Mr Beyeler says, when an exhibition from his now astonishing collection made a hit in Madrid, that he first realised that his paintings really ought to be on permanent exhibition somewhere.

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