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@Wetrix Equally there's vast amount of reliable research showing that anthropogenically produced CO2 has been contributing to that process on very significant scale.
Probably the most direct one is air concentration of carbon isotope 12C (fossil) as compared to isotopes 13C, 14C and 18C which are part of the natural CO₂ cycle.
This essentially means burnt fossil fuels are flooding the atmosphere with CO₂ that was long buried underground.