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Regarding the whole 'green' fuel search (sorry, I have no knowledge about Volvo diesels) - I think we eventually must accept that IC engines can't be used permanently to run our primary means of transport. Assuming we want life on Earth to be around a few thousand years down the track - we must find a much more efficient means of energy conversion.
Even if every car, truck etc used only 5L/100km, we'd still be stuffed eventually, due to massive population. Forest sizes are decreasing, car ownership is increasing.
IMO, diesel cycle efficiency is great, but not a solution. Likewise for biofuels. It's just like those bloody hybrid cars - they still use an IC engine, and don't achieve the economy of cheaper (though small) diesel cars, thus they are not a solution.
I guess what irritates me is that any steps forward in IC efficiency, only delays the time when we will switch to something else, especially since politicians thrive off statistics, and often minor gains or simply statistic fiddles count for a solution to them and those who decide how we live.
Drastic as it sounds, I would be glad to hear of dwindling oil supplies - even though it would bring on a harsh transition period.
Anyone agree with any of that? Disagree?
Julian
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