Saw an interesting feature on Dan Rather the other night, about people burning corn in their stoves for heat, and it being far cheaper than natural gas.  It brought up the question of how the people on the Ancient Worlds heated their homes.
Well, on Haven they went through all the systems that humans have used over the ages.  But in the later eras all homes were heated by gas or oil produced from renewable sources, the two most common being a seaweed that was grown in the shallow oceans, and a plant that was grown in semi arid areas with limited irrigation.  The oils extracted from these two products could be refined, and produce both gas and liquid fuels, which were fed through pipelines to where they were needed to provide heat.  Hydrogen gas was also produced by the use of electricity mixed with the organic gas and distributed through the pipelines.  None of these fuels in the later ages, were used to produce electricity. There was another means of doing that.  But Havens did not like electric heat.  They would complain it made them uncomfortable, irritated them.  So all heat was provided by combustible fuels.
On Hades all fuels were made from renewable sources, even in the early ages, as they had no coal or oil deposits they had to learn to use renewable fuels from the very beginning of their industrial age, which was very beneficial.  It produced far less of the environmental problems that plagued other worlds.  The Peepians, too, went through the different fuel ages, but in the end they, too, became dependent on renewable fuels. The chief one they used was hydrogen gas, created by breaking down water with surplus electrical power.  In the later ages this was their chief source of combustible fuel, as it could be made even from waste water.
It is believed that Earth will eventually follow the pattern of the other races and as fossil fuels run out, they will turn more and more, to fuels made from renewable resources, and transmit them to the already existing pipelines.  This would follow an easily recognizable pattern.

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 As Custer found out at The Little Big Horn, he wasn't that crazy!  A very interesting man!  Quite an interview!

The most incredible power of all is the  to forgive, and this young woman possesses it, greatly.  A have to read.