Well worth the effort to research them in my opinion.....http://earthship.com/ ..... without a doubt the man who first thought these up is a hero in my eyes.....
Here is the basic concept and a look at an epic one:
here is an example but design can vary immensely.....
Its all about self sustenance and living off the grid.....
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I personally plan on building one eventually just not sure when :)
Also I forgot to ask has anyone here attempted or succeeded in building one.