Today’s climate models are so inaccurate they must be improved a hundredfold just to detect a CO2 signal in climate change.
Though clouds “are the largest moderator of Earth’s radiation budget and their absorption of solar radiation directly influence our understanding of climate change,” NASA’s models of the cloud capacity to alter solar radiation diverge from satellite observations (MERRA2) by 18.8 W/m² (Fu et al., 2026).
“…the NASA MERRA2 modeled value [of the cloud capacity to absorb solar energy] is less than one-quarter of the observed.”
Image Source: Fu et al., 2026
To put this in perspective, the reported models-versus-observations discrepancy (18.8 W/m²) is 94 times larger than 10 years of accumulated clear-sky-only CO2 impacts (0.2 W/m² per Feldman et al., 2015).
NASA has previously admitted cloud impacts are so large and uncertain models “must be improved about a hundredfold in accuracy” to detect a human or CO2 impact on climate.
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claims of less cloud reflectivity in the past 40 years although measurements are not accurate, If those claims were true, days would be warmer and nights would be cooler. That is not happening. since 1975 days are warming but knights had been warming faster than days. the main cause of day’s warming is most likely a reduction in air pollution since 1980, based on accurate measurements, unlike cloud measurements
Mr. Greene forgets ocean heating. Oceans are heating during day and stay warm during nights, whereas land cools more during nights and heats more during days.
This report found:
Roles of Earth’s Albedo Variations and Top-of-the-Atmosphere Energy Imbalance in Recent Warming: New Insights from Satellite and Surface Observations
by Ned Nikolov 1,*ORCID and Karl F. Zeller 2
https://www.mdpi.com/2673-7418/4/3/17
“Our analysis revealed that the observed decrease of planetary albedo along with reported variations of the Total Solar Irradiance (TSI) explain 100% of the global warming trend and 83% of the GSAT interannual variability as documented by six satellite- and ground-based monitoring systems over the past 24 years.”