Mars may have released sulfur gases that trapped heat, shaped the climate, and created conditions for ancient life.

Heat transfer and melting in subglacial basaltic volcanic eruptions : implications for volcanic deposit morphology and meltwater volumes / L. Wilson & J.W. Head -- Mars : a review and synthesis of ...

While the early climate of Mars remains an open question, a new study suggests that its atmosphere may have been hospitable to life due to volcanic activity that emitted sulfur gases that contributed ...