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Wind power......and we hear "not in my backyard",
In addition suggest you read a paper by Robert Lyman "Why Renewable Energy Cannot Replace Fossil Fuels By 2050" (note: it is a PDF file and can be found by searching for the tittle) It might open your eyes....then again maybe not
I skimmed the paper. Given a number of assumptions, I think he makes sense. But I have to question some of the assumptions:
- let's say we can't entirely replace oil by 2050, so what? Shouldn't we do what we can in the meantime anyway?
- I've seen various projections about making fusion a reality, and in all of those, more R&D speeds up the process.
- we can also reduce energy usage. i just heard a talk about - more or less - allowing only golf-cart-style autos within urban areas.
- permaculturalists have demonstrate substantial farm efficiency improvements over "big ag", which is not surprising given how the profit motive even worms its way into feeding people.
I guess the summary is that the solution will be a combination of incremental improvements, and we should divert any, many more funds to R&D.