In the canonical 2300AD setting, the only worlds which have been terraformed into human habitability are Sans Souci and Nous Voila on the French Arm and Ellis on the American Arm. That strikes me as odd. Hochbaden and Dunkelheim elsewhere on the French Arm could also be good candidates, while on the Chinese Arm, worlds like Gerollblock in the DM-56 328 system (more Earth-like in its physical characteristics than Heidelsheimat, but unfortunately in the middle of a sterilizing asteroid belt), Dukou at Epilson Eridani, the unusually uninhabitable Pedro co-orbiting with garden world Paulo at Procyon, and the gas giant moon Syun at Zeta Tucanae, which already has a thin nitrogen-oxygen atmosphere. On the American Arm, the planet Dawes is located one orbit out from King but is still in the outer life zone and could potentially by much more Earth-like than King. In the Core, finally, Mars at Sol and Limbes orbiting Alpha Centauri B are also candidates. There are almost certainly other worlds, located in planetary systems never described in the Colonial Atlas or other sources, which might also be transformed.
There are good reasons that terraforming hasn't touched any of these worlds. Including the costs of life support, it would be much more inexpensive to set up a colony on a fully Earth-like world, even if it's a relatively inhospitable one like Cold Mountain or Aurore. Lost Hochbaden is a partial exception, but it was built by Bavaria specifically as a showcase colony for which money would presumably not have been an issue. More, the three worlds which were/are being terraformed were at worst marginally post-garden, either heavily glaciated or desertified. Of the worlds that I named above, Dunkelheim (desertified), Dawes (glaciated) and Syun (which I'm guessing is desertified) are the only worlds that come close to meeting these criteria. Combine these economic and technological issues with the fact that many of these systems were colonized only recently and are still lightly populated, and you've got a pretty good explanation for the lack of ongoing terraforming.
It isn't a perfect one, though. The world of Syun is located in the middle of the long-settled Delta Pavonis-Beta Hydri-Zeta Tucanae-Rho Eridani-82 Eridani corridor, and apparently supports a sufficiently complex biosphere sufficiently complex to produce a barely breathable atmosphere. Dawes is heavily glaciated and apparently lifeless, but the King system has been settled for a century and Dawes seems to be much more potentially Earthlike than King could ever be. In the Core, meanwhile, the established stutterwarp powers with their extrasolar holdings might have little reason to invest in costly programs close to home, but nations which lost out in the great game try to do whatever they could with the worlds that none of the larger powers had bothered to claim.
There is plenty of room for more terraforming in 2300AD, whether implicitly in as in canonical sources or explicitly in a variant timeline. It could be something as simple as Indonesia working on Mars or INAP activity on Limbes, or the efforts of a Chinese Arm power (Manchuria, Canton, Japan ...) to make Syun more attractive, or the beginnings of a great American project to transform Dawes into a garden world. The numerous adventuring possibilities for people associated with massively complex activities operating on a scale of a planet if not an entire planetary system can best be left to the reader's imagination.
There are good reasons that terraforming hasn't touched any of these worlds. Including the costs of life support, it would be much more inexpensive to set up a colony on a fully Earth-like world, even if it's a relatively inhospitable one like Cold Mountain or Aurore. Lost Hochbaden is a partial exception, but it was built by Bavaria specifically as a showcase colony for which money would presumably not have been an issue. More, the three worlds which were/are being terraformed were at worst marginally post-garden, either heavily glaciated or desertified. Of the worlds that I named above, Dunkelheim (desertified), Dawes (glaciated) and Syun (which I'm guessing is desertified) are the only worlds that come close to meeting these criteria. Combine these economic and technological issues with the fact that many of these systems were colonized only recently and are still lightly populated, and you've got a pretty good explanation for the lack of ongoing terraforming.
It isn't a perfect one, though. The world of Syun is located in the middle of the long-settled Delta Pavonis-Beta Hydri-Zeta Tucanae-Rho Eridani-82 Eridani corridor, and apparently supports a sufficiently complex biosphere sufficiently complex to produce a barely breathable atmosphere. Dawes is heavily glaciated and apparently lifeless, but the King system has been settled for a century and Dawes seems to be much more potentially Earthlike than King could ever be. In the Core, meanwhile, the established stutterwarp powers with their extrasolar holdings might have little reason to invest in costly programs close to home, but nations which lost out in the great game try to do whatever they could with the worlds that none of the larger powers had bothered to claim.
There is plenty of room for more terraforming in 2300AD, whether implicitly in as in canonical sources or explicitly in a variant timeline. It could be something as simple as Indonesia working on Mars or INAP activity on Limbes, or the efforts of a Chinese Arm power (Manchuria, Canton, Japan ...) to make Syun more attractive, or the beginnings of a great American project to transform Dawes into a garden world. The numerous adventuring possibilities for people associated with massively complex activities operating on a scale of a planet if not an entire planetary system can best be left to the reader's imagination.
