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OK UT, how about...
Coal... for the next 10 years/then complete shutdown
Methane... for the following 10 years/then almost complete shutdown
Mixed solar, geothermal, hydroelectric, etc ... thereafter
Ultimately, oil will stop being a fuel and will be only a lubricant.
Electrical power will replace long distance carbon-based fuels
Nuclear, perhaps in a StarTrek sort of way, may be the ultimate long range fuel.
But until the waste disposal is acceptable, it probably "can't fly"
When these will happen will depend on when such decisions as:
... shut down the long haul trucking industry in favor of rail shipping
... shut down business air travel in favor of internet-types of video conferencing
... shut down personal air travel in favor of high speed rail service
The mechanisms of these changes will probably be $ and public attitudes.
It's the long term negative effects (nuclear waste storage, water contamination,
over-consumption of non-renewable resources) that need to be considered now,
not later when resolution of such problems will be more expensive or un-do-able.
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