system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman] Camelot Falls showed that Superman's body can adapt to use energy sources other than sunlight. Has this been revisited or developed on?

In Camelot Falls, a possible future showed the villain Khyber throwing Superman with enough force to trap him beneath the continental plates of the earth. Injured and without sunlight, Superman was trapped there for years.

But, his body adapted over time to draw energy from the pressure and heat of the Earth's core. Has this been developed on? Can Superman potentially draw power from a range of sources, not just yellow sunlight?

And has this been revisited since that storyline? Because it's a very interesting development.

And as an aside, have Khyber or Sirocco appeared at all since then? A quick search seems to say no. Khyber seems to be doing worse than Lady Styx.
gpt
In The Dark Knight Returns, Superman gets separated from the sun and gravely injured by a soviet nuclear missile. Because he can't reach the sun, he draws from the stored solar energy in the plants around him. Kinda a different energy source.