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There are a lot of things that we could be doing to be more efficient. I've mused that I've got a fridge that pumps heat out the back warming the house and an air conditioner pumping heat out of the house, then I've got a water heater using fuel to generate heat. I've also got world class clean water sitting in a bowl that I poop into while I've got reasonably clean water just running down the drain when I shower or rinse my hands.
I'd like to see more of a "heat exhange" line of appliances. My fridge can cool my food by heating my water, along with my a/c. My hand-rincing water could go into the pooper, or with mild filtration and wise cleaning product selection, it could be used to water my lawn. All my drainage water could run through a turbine and my incoming water has way more pressure than needed... it could turn a turbine as well.
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