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I think the earth is frozen is an exaggeration, but rather the earth has entered an ice age, because of the sun...our earth too has several long ice age in the past, and is scheduled to entered another ice age in the future...In the ice age it's not like life can't survive, we have mammoth and the like too so it's not far fetch, and the ice age most likely do not cover the entire world, rather just about 60-80 % and most likely only covering the equator, leaving the far North and south area quite clear.
As to why they cannot found land? It's not they cannot found it, they may be unable to..the technology not that advanced, i dont think they have access to satelite...they are pretty restricted to galactic road, most of the supposed land have been submerged leaving the land far and few in between, the continent also shift, making the past map pretty useless so they have to rechart the map.
in the gargantia world, the ancestor of ledo think the earth is not exactly ideal for living because of it and opt to search for another planet rather than staying most likely, while there is another faction that want to stay because of reason we not know...
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