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Ecosystems at the bottom of oceanic trenches rely on energy from volcanic vents (chemosynthesis) instead of photosynthesis

Fascinating! Although chemosynthesis uses CO2, I did not expect Methane to be a carbon source

Deep sea vents are not dependant on the photosyntheic carbon cycle.

Other extremophiles and archea exist and have been observed in deep caves and rocks. Life really does find a way!

Fascinating! The source of carbon can still be carbon dioxide, in addition to methane.

Hum... There is plenty of life that don't care about high concentration of those gases.

Yes, like humans we don't care about CO2, but we depend on creatures that indirectly or directly use it.