Ultimately, from a very long term perspective, one has to recognize that fossil fuels are not going to last forever -- at least in an economically viable form.

Ultimately, from a very long term perspective, one has to recognize that fossil fuels are not going to last forever -- at least in an economically viable form. The exact nature of when we (for all practical purposes) fossil fuels become economically too costly has been hotly debated over the years (it will be a while, sure) but since our economy is so dependent on them, I would view exploration of practical fossil fuel reduction as a win for this reason alone -- perhaps it is a matter less urgent than climate change, but it still is something to consider. Yes, there are limits to extraction, but solar and wind power's advantage is that, location wise, it is viable in far more places than something like hyrdo power; it also can be set up in a more decentralized fashion which can be advantageous for some scenarios (remote areas with little existing infrastructure for instance). I've always thought that solar and wind's biggest challenge to overcome is more the non-continuous nature of that power source. At any rate at this time I don't think it's safe to predict what a long term solution might be or might not be. There probably is (as like now) no single solution that is right for every location.