Tracing the history of the corner stone of the greenhouse effect GHE in the form of downwelling long wave radiation DLR from the atmosphere to the Earth surface with a supposed warming effect from in particular CO2, leads to
- Notes on Radiation in the Atmosphere by D. Brunt (1932)
- On the Variation of the Atmosphere Radiation by Anders Ångström (1925)
- DLR = (a - b 10^(-ce)) sigma T^4 (Anders Ångström)
- DLR = (a + be^0.5) sigma T^4 (Brunt)
PS Knut Ångström (1900) questioned (father of Anders) the warming effect of CO2 claimed by Arrhenius (1896), but his son Anders contributed to GHE by his empirical formula for DLR.