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The problem with this is entropy. Heat dissipated to the environment is highly entropic (more disorganized, less useful heat/energy), and to effectively extract it, you’d need to reduce the entropy, which requires more energy that you would get from the heat you recovered.
My first day visiting Albuquerque, I was in pizza parlor picking up an order, and the news was on a TV nearby. They were covering the arrest of this cracked out looking couple. The lady behind the counter then explained to me that it was a big local story because those two had tortured and murdered their daughter. Its also the cartheftt capital.
I haven’t been back.
I’m reliant on the state for defence on a larger scale, but in our personal lives, the state can do little to defend us from other individuals in a timely manner. That is why I believe everyone that is able to should be responsible for their own personal defence.
I’ve no desire to injerect in others lives, but I do have a desire to protect myself and my family where the state cannot or will not.