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A comment on Estonia becomes the first to open a nationwide electric vehicle charging network. Parent comment
For "cold" see [2] the idea of using the potential energy of snow on mountains (or hills). Maybe create artificial avalanches.
For "darkness", no idea. :)
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[1] http://phys.org/news120216714.html
[2] http://www.newton.dep.anl.gov/askasci/eng99/eng99635.htm
For "cold" see [2] the idea of using the potential energy of snow on mountains (or hills). Maybe create artificial avalanches.
For "darkness", no idea. :)
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[1] http://phys.org/news120216714.html
[2] http://www.newton.dep.anl.gov/askasci/eng99/eng99635.htm