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While great nations fretted over coal, oil and global warming, one of the smallest at the U.N. climate conference was looking toward the heavens for its energy.</p>
<p>The annual meetings corridors can be a sounding board for unlikely solutions to climate change from filling the skies with soot to block the sun, to cultivating oceans of seaweed to absorb the atmospheres heat-trapping carbon dioxide.</p>
<p>Unlike other ideas, however, one this year had an influential backer, the Pentagon, which is investigating whether space-based solar power beaming energy down from satellites will provide affordable, clean, safe, reliable, sustainable and expandable energy for mankind....
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