New study finds low CO2-sensitivity again
A new paper by Frank Stefani compares solar variability and CO₂ emissions as drivers of global sea surface temperatures. Using the solar aa geomagnetic index alongside CO₂ data, the study estimates a transient climate response (TCR) of about 1.1–1.4 K, near the lower end of the IPCC range. The results align closely with other observation-based estimates and highlight the continuing scientific debate about the relative roles of solar activity and greenhouse gases in recent climate change.