Lots of places. The writing is on the wall. The technology is getting there. The world needs to double it's amount of energy available in the next 20 years to keep up with growth. That is simply not achievable with fossil fuels. Nuclear is very unpopular... this means there is going to be a lot of money available for alternate energy. Solar cells are getting smaller and more efficient every year. Carbon nanotubes are starting to appear in solar cells which boosts their efficiency greatly. At that does not even mention hydrogen fuel cells.
So here is the trend... Solar is getting cheaper, more efficient and more widely available (not to mention more socially acceptable)
Fossil Fuels are getting more expensive, the quality is going down as the 'good' reserves are being used up first. They are also getting less available as we burn them and as wars make it more troublesome and expensive to extract it.
Couple that with exponentially shorter development times as technology progresses and it is going to happen. It has to... not because we want to save the environment or be responsible but because there is money to be made in alternate energy.
Take a look at this trend:
http://www.earth-policy.org/Indicato...tor12_data.htm
It's not a linear trend. Fossil fuel growth doesn't have this same kind of a curve.
Technology growth is an exponential curve made up from a series of S curves. A technology starts out slow and gradually builds then as it is begins to work and become profitable, it goes through an exponential growth period. As the limits of that technology are reached the curve slows down and you get an S shaped curve. But the amazing thing is that as that technology starts to slow down, a newer technology always emerges with a new S curve that starts to take off as the old one flattens. If you average these S curves together, you will notice that the overall trend is exponential and the new technology increases what the old one can do by several orders of magnitude.
We have seen the effects of this technology expansion on computation already. We started out with manual computations. They were slow... pencil and paper type of transactions. This lasted thousands of years. Electromechanical technology (punch cards) increased our computational power. These got faster and faster on an S curve but eventually topped out where relays took over and gave a new fresh S curve... which was replaced by S curves offered by vacuum tubes, then transistors, and eventually integrated circuits. Now as the physical limits of transistors are starting to be seem, new technologies in nanotech and quantum computing are starting to emerge promising to carry on the exponential scale
http://en.wikipedia.org/wiki/Image:PPTMooresLawai.jpg
http://en.wikipedia.org/wiki/Acceler...rating_Returns
This is not just in computing. This trend can be seen in ALL forms of technology... it is just the most obvious in computing since that technology is the furthest along in its exponential curve. Many of the curves that look kind of linear are really exponential, they just look like the start of the curve we saw in early computing. It is exponential, though... and that will be much more obvious in the next 20-50 years.
The same kind of curve is now obvious in wireless computing.
And in 20 years, it will be obvious in energy production too. We are simply at a shifting point between fossil and clean energy production.