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Garbage/trash dumps and also biomatter from farms etc. create heat in large dumped volumes. If a water contaner were to be placed into the center of the mound of trash or bio matter or coils of piping were placed in the center of the rotting mass, hot water could be produced for washing, or house heating for poor populations living nearby.

Reward: Free for the greater good on the condition that it's acknowledged Greg Jones is the originator of the idea.

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