I think one of the first steps to trying to stretch out what we already have it to localize our energy supply grid. Take it down to the level closest to where it is going to be used. Thus there will be less "lost" in transit, and then you can feed the unused portion back into the grid. Granted this is not sustainable this is using what we already have trying to stretch it out to give us more time to find a truly sustainable source.
http://blogs.msdn.com/joev/archive/2009/01/12/big-ideas-in-sustaina...The majority of the sustainable sources are not truly sustainable, or are not yet practical for mass application. The silicon in cells, and the precious metals will also come to an end just like our fossil fuel issue.. it just buys us more time.
We are just not at the point yet that we have a sustainable energy source that is truly ready to go to market. We have a number of sources that can hold us over till we get there, but for how long and at what price?
http://www.newscientist.com/article/dn16550-why-sustainable-power-i...Solar and wind are good representations for things that are generally seen as sustainable, we are not going to use it all up. The problems come with these to get them to market in mass scale, to truly solve the problem.
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