Based on my research, here is my assessment of the claim:

Assessment

Understanding the Claim: The statement "If Dai Ato's research is correct, cutting human emissions will not lower atmospheric carbon dioxide levels" is a conditional claim. It asserts that Dai Ato's research conclusions, if true, would imply that reducing human CO2 emissions would have no effect on atmospheric CO2 levels.

What Dai Ato's Research Actually Claims:

• Dai Ato is an independent researcher from Japan who has published in "Science of Climate Change" (SCC), a journal that explicitly states its objective is to publish contributions "which contradict the often very unilateral climate hypotheses of the IPCC"¹
• Ato's 2024 paper "Multivariate Analysis Rejects the Theory of Human-caused Atmospheric Carbon Dioxide Increase: The Sea Surface Temperature Rules" uses regression analysis and claims sea surface temperature (SST) is the "independent determinant" of annual CO₂ increases, while "human CO₂ emissions were irrelevant"²³
• Ato concludes that "human efforts to curb CO₂ emissions have been, at least in the past, meaningless"²

Why This Research Is Contradicted by Mainstream Science:

• The IPCC and NASA state "it is unequivocal that the increase of CO2...in the atmosphere over the industrial era is the result of human activities"⁴⁵
• Direct observations show that the atmosphere retains roughly half of anthropogenic CO₂ emissions, with the remainder absorbed by land (31%) and ocean (23%) sinks⁶
• Multiple lines of evidence including isotopic ratios (carbon-13 and carbon-14), atmospheric oxygen decline tracking fossil fuel combustion, and inventory data confirm the human origin of CO₂ increases⁴⁵
• The IPCC explains that "net zero CO2 emissions" would cause atmospheric CO2 concentrations to "gradually decline to a long-term stable level as excess CO2 in the atmosphere is taken up by ocean and land sinks"⁶

Critique of Ato's Methodology:

• Ato's analysis uses annual changes in CO₂ as the dependent variable rather than cumulative atmospheric concentrations
• His finding that SST correlates with year-to-year variations does not establish causation or negate the established fact that human emissions add carbon to the atmosphere faster than natural sinks can remove it
• The SCC journal is not recognized in mainstream climate science and was created specifically to platform alternative views rejected by the IPCC consensus¹

Conclusion:

• If Ato's research were correct (that human emissions are irrelevant to atmospheric CO2), then logically, cutting emissions would not lower CO2 levels
• However, Ato's research is contradicted by overwhelming scientific evidence and is published in a journal explicitly dedicated to contradicting mainstream climate science
• The premise of Ato's work—that human emissions don't affect atmospheric CO2—is fundamentally at odds with basic carbon cycle physics

Overall validity: 15%

1. Science of climate change
2. [PDF] SCC-Ato-Multivariate-Analysis-Vol.4.2.pdf - Science of climate change
3. Dai Ato: The Sea Surface Temperature Rules
4. Scientific Consensus - NASA Science
5. [PDF] The Carbon Cycle and Atmospheric Carbon Dioxide
6. Chapter 3: Human Influence on the Climate System - IPCC