2 Questions about discolored photographs - What do you call those film photographs with blue-green tints, and how do you fix the most extreme cases?

[Reptorian]

I was able to get to here with the tourist photo (2 Versions) -

First, this was RGB Adjustment, and then swap into LAB adjustment, and then applied another layer of RGB adjustment. One was more intended to have white color, and the other is more intended to have colors preserved.

Not sure how I can fix up the trees on the background. I believe RGB Tone in G’MIC can fix it up.

That being said, there must some way to recover lost information or at least have some convincing way to look like as if they have been recovered.