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Metal-catalysed CO2 hydrogenation is considered a source of methane in serpentinized (hydrated) igneous rocks and a fundamental abiotic process germane to the origin of life. Iron, nickel, chromium and cobalt are the catalysts typically employed in hydrothermal simulation experiments to obtain methane at temperatures >200°C. However, land-based present-day serpentinization and abiotic gas apparently develop below 100°C, down to approximately 40-50°C. Here, we document considerable methane...