Pau Fonseca

Here is PROOF that the 21st-Century warming was 100% caused by the observed increase of Earth's absorption of solar radiation due to a decreasing planetary albedo: The attached graph shows two official measured data series: changes in absorbed solar radiation (ASR) according to NASA CERES Project, and changes in global temperature according to 3 surface data sets. Diving the observed temperature trend (0.261 K/decade) by the observed ASR trend (0.876 (W m-2)/decade) produces an EMPIRICAL estimate of the climate sensitivity to ASR, i.e. 0.261/0.876 = 0.298 K/(W m-2). Compare this data-based climate sensitivity to a theoretical estimate produced by the independent and objectively derived model by Nikolov & Zeller (2024: mdpi.com/2673-7418/4/3/17), their Eq. 15b (see second attachment). The modeled sensitivity is 0.297 K/(W m-2), which virtually identical to the empirical one! Since the Nikolov-Zeller model only quantifies the response of Global Temperature to ASR without including any GHG "radiative forcing" or "positive feedbacks", the perfect agreement between empirical and theoretical climate sensitivities strongly suggest that the 21st-Century warming was solely caused by the observed decrease of Earth's cloud albedo without any measurable effect of "greenhouse gases". This implies that the GHG "radiative forcing" generated by IPCC's climate models is NOT real and there are no amplifying feedbacks operating in the climate system!