In news: snipped-for-privacy@movingvision.demon.co.uk, Moving Vision blithered:
I clearly? do not have a full knowledge nor understanding of this emotive subject, however as I understand the operation of the two 'engines' there is basically no difference, they both burn the same fuel and are essentially the same construction. They are both gas turbines burning kerosene, in the turbo prop the shaft drives an external propellor, in the bypass turbojet the compressor is oversize and contibutes to the thrust of the engine by bypassing the combustion portion. Ergo only detail differences in fundamentally the same system. I am at a loss therefore to see how there would be substantially if any difference in the pollution potential or otherwise between them.