Urth/Blue
I have not posted here before so I apologize if this topic has already been addressed and I just missed it. However, I am curious if anyone has discussed or considered the idea that Urth and Blue are actualy the same planet in a different time. My reasons for thinking this are as follows:
I do not know exactly what is happening to the "red sun" of Urth but I do know that Sevarian describes the place in which he lives as having mild summers. If we assume that he is indeed somewhere in South America as some have theorized that means he is also near the equator. Unless I have missed something this means that it should be rather warm. So if this part of the world is substantialy colder than our present world as a result of the sun dieing I believe it is safe to asume that the rest of the world is even colder. This would mean that a good deal of the worlds water supply is frozen. So the coming of the new sun (a brighter and warmer sun) could potentialy melt the polar ice caps and flood the world.
I don't see any reason why this couldnt be what the folks from the long sun call blue. If I am not mistaken the moon that Sevarian describes in BotNS is green.
Please let me know if I am missing anything here...