It's amazing how rapidly alternative sources are being developed. The biggest hurdle is the heavy equipment needed to do the work. Still numbers like 7/10 and 12 years pop up and that is a long time if any of the very tenuous sources are shut down. The market is on pins and needles to every little event. The consumption side is still like a tidal wave as population grows. No problems in 1800 at one billion. Some concern in 1950 at 2 billion. With 6.5 billion in 2000 headed for 9 in twenty years or so the people side of the equation is going parabolic with lots of issues to consider. It's truly a war of the worlds.

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89 300E
79 240D
72 Westy
63 Bug sunroof
85 Jeep CJ7
86 Chevy 6.2l diesel PU

"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
Marcus Aurelius