Letter: Dirty rockets

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The Independent Online
Sir: Nelson Cunnington (letter, 11 July) would have us believe that because the product of rocket combustion is water the process is non-polluting. Clever, but not clever enough.

To produce the deoxidised hydrogen fuel, energy is needed, from eg burning coal or oil. The overall effect then becomes one of carbon-dioxide generation.

ROBERT P CLARKE

Birmingham

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