dunnoob wrote: If you are forced to transform an ocean tile with whales or fish to swamp while building a land bridge, you can transform this swamp back to ocean later. If many tiles are converted (global warming or nuclear winter) it's hard to fix it, if you don't recall where the special resources were.
But you could save + leave the game, load an older state to check the map, quit that + load the last manually saved game again, then try to fix the damage. Some damages can't be fixed, e.g., there's no way to get a lost glacier or a lost jungle back (in the classic ruleset), but you can transform tundra to desert, and if the tundra was glacier with arctic oil you will get desert with desert oil.
Just a clarifying note on this: in the Work menu the transform option tells you what the tile will be and this includes the extra. This was 2.4 but I haven't tried it for 2.5 yet. Note that this works if only if you need a single transform to get back to the original tile. The new transform from swamp to lake may kill this idea. When it floods back to ocean do you still get whales ? You should at least get to keep fish even with the double transform but has anybody tried this in 2.5+.