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ehh.. but we can, technically, keep using combustion engines forever. A diesel engine will burn nearly anything liquid and flammable, and there are several fuels that can be synthesized with acceptable efficiency, so as long as the world can produce electricity, then combustion engines are an option. Now, economically, electric engines and batteries are quite likely to be about 3-4 times cheaper, but for applications where energy density is sufficiently important, "3-4 times more costly fuel than electricity" is still quite cheap.
by Thomas on Fri Jul 30th, 2010 at 12:35:24 AM EST
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Expanding on this: Lets go with extreme pessimism about what is possible - The most widely synthesized chemical in the world is ammonia, which is a viable combustion engine fuel, even if it is rather less user friendly than gasoline. Further, let us assume that the only economically viable low-carbon power sources we are ever going to have are wind and nukes.
At five cents/kwh the cost of producing one metric tonne of ammonia via electrolysis is 6-800 dollars. This is not an unreasonable price to pay for the power density  
and note, since electrolysis can, in fact, be switched on and off at the drop of a hat, this could be night time surplus from nukes or the full output of a wind farm located in an optimally windy area specifically for this purpose so 5 cents/kwh is, in fact, a rather high estimate of actual cost, and cheaper electricity crashes the price hard. Dammit, now I am wondering why the farmers of the world arent already running their tractors off ammonia..
by Thomas on Fri Jul 30th, 2010 at 01:21:42 AM EST
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Actually, there is a significant segment of the agriculture industry that does use ammonia as fuel. IIRC, this ammonia is make in Louisiana as a byproduct of the petrochemical industry and transported up the Mississippi for use in Iowa, etc. where there is farm equipment that can run on it. I also recall that the production of ammonia as fuel has been proposed as a use for "stranded wind".

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sat Jul 31st, 2010 at 10:47:42 AM EST
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What is the scope of sustainable use of liquid fuels?

Driving on a highway can be replaced by mass transportation or electric vehicles, so we're talking about off-road high-power vehicles: agricultural and construction machines, and military vehicles.

By laying out pros and cons we risk inducing people to join the debate, and losing control of a process that only we fully understand. - Alan Greenspan

by Migeru (migeru at eurotrib dot com) on Fri Jul 30th, 2010 at 02:18:14 AM EST
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and due to the engineering difficulties of transoceanic high speed rail, aviation.
by Thomas on Fri Jul 30th, 2010 at 11:59:25 PM EST
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LOL - blind spot!

We could always resurrect the Zeppelin.

In the 1930s, Zeppelins successfully competed with other means of transatlantic transport. ... [Least] importantly, the technology was potentially more energy-efficient than heavier-than-air designs. ...

Today, with large, fast, and more cost-efficient fixed-wing aircraft, it is unknown whether huge airships can operate profitably in regular passenger transport though, as energy costs rise, attention is once again returning to these lighter than air vessels as a viable alternative.



By laying out pros and cons we risk inducing people to join the debate, and losing control of a process that only we fully understand. - Alan Greenspan
by Migeru (migeru at eurotrib dot com) on Sat Jul 31st, 2010 at 04:23:40 AM EST
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If your customers are willing to spend days making the crossing, you might as well operate nuclear-propulsion super liner ships. not much slower than a zep, safer, and much, much cheaper.
by Thomas on Sat Jul 31st, 2010 at 12:08:44 PM EST
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