Quote:
Originally Posted by ravens_cry
So is coal and oil then, the energy for both came from the sun. The only form of energy that isn't solar is Nuclear, and if you streatch a point slightly, even it is. Supernovas and al that jazz.
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The difference is that firewood is renewable (real time). Coal and oil use represents a compression of many millions of years of solar-fueled biology and botany compressed into a hundred years or so.
The production/use ratio is about a million to one (1E6:1 aka 1M:1 aka 1,000,000:1)
Thus, it's non-sustainable.
Wood, with a production/use ratio of 1:1, is sustainable.
You're right about everything being solar, in one sense of the word or another...