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A comment on Google spinoff Dandelion uses ground energy to heat and cool homes. Parent comment

Re:Google spinoff Dandelion uses ground energy to heat and c... by rossz on Wednesday May 30, 2018 @11:20AM (#17188360)
Apparently abrasive media cutting, using concrete driven by hypersonic air (? maybe)

https://spectrum.ieee.org/energywise/energy/renewables/is-go...

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