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Published online by Cambridge University Press: 24 August 2009
* A referee comments that ‘The temperature rises from CO2 are still uncertain and any mention of a possible rise of 8°C gives an exaggerated view.’—Ed.
† It should be pointed out that hydrogen from nuclear reactors would be very expensive and would require prior acceptance of nuclear power.—Ed.
* A referee points out, however, that ‘The use of hydrogen as a fuel may prove to be more dangerous than [that of] existing fuels’.—Ed.