R. Louw Chemical Engineer, Stokesley, England W. A. van Wijngaarden Department of Physics and Astronomy, York University, Canada W. Happer Department of Physics, Princeton University, USA November 27, 2025 Abstract The main determinants of Earth’s absolute surface temperature, T, are the solar constant, S, the Bond albedo, A, and the effective emissivity for thermal radiation, ϵ. In this note we … Continue reading Sunlight, the Bond Albedo, CO2, and Earth’s Temperature