rlsh, superhero, author, actor, I am raising $1 trillion for wind, solar and geothermal energy. Spread the word.
1802 days ago
a lot of energy could be saved with this window designed to block suns heat in summer and let in heat in winter @cbcbottomline
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a roll up blind between the glass that blocks heat out in the summer but insulates in winter would save energy from heating and airconditioning costs @treehugger
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