Dixie, you're a bonehead - the crux of the entire discussion has been whether alt energy can effectively fulfill the majority of our energy needs by mid-century.
Sorry you came in late, and tried to sound like you knew everything.
No, you are the bonehead, or more precisely, the pinhead! I have read the thread discussion, it is 5 pages of you and Superfool (aka: tweedle-dee and tweedle-dumb) pontificating on how alt fuel will almost totally replace oil by 2050. 80% is what is claimed, with oil still holding 20% of the energy market. Top has pointed out how ludicrous this "dream" is, and Duhla has interjected nothingness from time to time.
Now... I will say, it is feasibly possible for alt fuel to dominate by 2050, but the things that would have to happen, are not going to happen in the universe we live in. So, it's a dream. You can believe in a dream if you like, nothing will stop you from that, and sometimes, it is good to dream! (I'm sure Duhla has a comment on this.) Nevertheless, alternative fuels will not replace oil for many decades, it's simple economics. At the present time, it is pinhead liberal environmentalists pushing alt fuel technology, and not capitalists. As long as that dynamic remains the same, alt fuels are dead in the water.
Here's an example of what I am saying, just so you can get an idea... Let's say we tell the Big 3, you go develop and market an alt fuel vehicle, it can't burn fossil fuels at all, and any research & development costs are tax exempt, AND... any profits you make in the next 20 years on these vehicles, is also tax exempt. At the same time, we tell the energy companies, you build viable fueling stations for the alternative fuel vehicles, and all of your profits for the next 20 years, are tax exempt. Chances are, in the next 20 years, we would see remarkable things happen, because capitalists have an incentive! Even with some program like this, it would be difficult to replace oil to even a 50% level, because of heating oil, farm equipment, 18-wheelers, airplanes, and other things that would still require oil energy to operate. Not to mention, all of the "poor people" out there, who couldn't afford to buy a new alt fuel vehicle, and would opt to keep their gas-burner as long as it ran.
This is why it will take 50 years, at a minimum, for alt fuels to effectively replace oil as a predominate fuel source. That is an optimistic goal at best, it may be 'dreaming' to even think it possible in 50 years. And if pinheads aren't going to relinquish control of alt energy to capitalists, I don't think THAT is even possible. The point is, for alternative energy to have a chance, capitalism will have to get involved in a big way, otherwise, it will be a long long road to alternative energy replacing oil as our main source of fuel.
Now let's examine what will happen if and when capitalists do get involved in a big way... they will naturally make huge profits, and as soon as this starts to happen, pinhead liberals will start to scream and moan about Big Alt Fuel! Taxes and regulations will be passed and mandated, choking the profitability in the industry, and stalling any progress in oil independence. Your kids will be screaming about how it's not fair the Alt Energy companies make so much money, while people are homeless and school kids are starving. They will feel the need to provide for the elderly who have no Social Security anymore, is far more important than giving another tax break to Alt Fuel!