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Howdy all! I wonder if any of you have come across this site called "Planetocopia" - http://www.worlddreambank.org/P/PLANETS.HTM
Somebody named Chris Wayan (who I imagine had a lot of free time on his hands!) dreamed up all these wild planets as thought-experiments, some of which are alternative or future Earths, and others homes for alien civilizations. He goes into almost Tolkien-level detail with fanciful (often witty) names and histories for these planets, and the nice thing is from what I can tell he went about all of it with pretty solid scientific foundations. Somebody drew some cool looking maps, too.
Planet "Dubia" (heh...!) seems like a particularly relevant one for us...a hypothetical Earth 1000 years from now, assuming all conservation efforts completely failed: http://www.worlddreambank.org/D/DUBIA.HTM
A fun diversion, if nothing else... in one world, "Inversia", he imagines removing every drop of water from the earth, sending every point of the (now dry) surface to its "opposite" with respect to sea-level (i.e. a mountain 1 mile tall becomes a trench 1 mile deep) and then putting all the water back. Hilarious stuff.