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Alex please there is a difference between logical extrapolation and total irrational speculation.
I find any talk of the possibilty of the unprovable as mere speculation. Mars has a very thin atmosphere. It may have bacteria deep in the ground. Cities of sentient beings is just not on as there is no biosphere to support this sort of complex society.
We humans are damaging our life support systems to the point where we wiil have a major problem soon. The Earth will heat up due to our CO2 pollution by at least four degrees. This is before the systems reach equilibrium. We cannot accurately predict the final outcome but it will not be pleasant. Apart from destroying the forests and fisheries we are all at fault by simply being here.
We are using our resources as if we have almost two planets called Earth. For a smart species we are not very bright.
I do not care for me as I will most likely be dead when the the Earth's systems change irreversibly. Goodbye and thanks for all the fish!
Bert
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