evidence: Cherry-picking: The article supports its claim with only two papers while ignoring the vast body of existing evidence that disproves it. The two papers in question are written by authors with no background in climate science and have been debunked by scientists who showed that they relied on flawed methodologies and made fundamental errors. For example, a more productive biosphere would be a net carbon sink and therefore decrease CO2 concentrations in the atmosphere, rather than increasing them. [...] An article authored by Chris Morrison in The Daily Sceptic, an outlet with a track record of scientifically unfounded messages, makes a conflicting claim: that changing isotope signatures in atmospheric CO2 result from the biosphere, rather than human causes like fossil fuel emissions. The article primarily cites "a new paper" published in February 2024 and supports its claim with a second paper published two years earlier. The article then upholds the two papers’ findings as scientific evidence that the human impact on climate change is "non-discernible". [...] Therefore, the scenario that a more productive biosphere could simultaneously push down δ13CO2 and increase the amount of CO2 in the atmosphere makes little sense. "If [the carbon-12] were coming from the biosphere, we would have had to lose carbon," Graven told Science Feedback.