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I believe there's a NOVA documentary about how the Easter Island stone heads were moved and raised that's basically also simple and requiring only stone age technology. One of the reasons Easter Island no longer has trees is because of human beings, as is true of Iceland. All that wood got used up for one purpose or another, and not because they didn't care, but because they didn't know the problem of sustainability.
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"Enough!!" -so rang Barack Obama's voice off the walls of Mile High Stadium
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