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NASA's Perseverance rover detected complex macromolecular carbon on the surface of a Martian rock at Bright Angel, the shallowest such detection of organic matter on Mars. The carbon's origin remains unclear, but on Earth it would suggest biological activity.
A study reveals that weathering of organic carbon can release CO2, amplifying warming, while silicate weathering still draws down CO2 but must work harder. This adds a small amplifying effect to human-caused warming over centuries.