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Similarly, aviation accounts only a small portion of CO2 emissions and there are no apparent alternatives to hydrocarbon fuels for aircraft which do not result in huge tradeoffs. The funds spent on attempting to develop and deploy hydrogen fueled aircraft or some other alternative are very high and there would be tradeoffs in the capabilities and economics of operation. Therefore, it is not wise to invest much effort or funds in such a pursuit.
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Hurrah!! Somebody speaking sense about aircraft pollution!!