Continuing in the correct tradition, Venus is hot MOSTLY due to internal (“geo”thermal) reasons – and NASA knows it.
No stupid runaway greenfraud effect necessary.
This article is dedicated to Hans Schreuder, R.I.P.
Update – 2020/01/14
Somebody complained that NASA’s diagram shows geothermal as being a little over 500K, which is not enough for Venus.
This has no credibility. Here is a zoom-in of the diagram:
Treating the 500 marking as pixel 0, the 2500 marking appears at pixel 546. This means that each pixel represents 2000 / 546 = 3.663 Kelvin
The center of the dark black geothermal line falls at pixel 65.
500 + 65 * 3.663 = 738.095
According to NASA, Venus’ surface is: 737K