The sun has it, Earth's industry, people, animals, vegetation, oceans, all eclipsed by solar irradiation.
0.04% co2 ain't doing it!
The atmosphere of Mars is mostly co2, so it must be very hot there, yes?
"Average -63°C". Oh, No, so why the low temp?
"Martian weather.. differences were directly related to changes in the solar energy that reached Mars."
Earth getting roughly 1361 W/m2.
[34]", whereas
Mars is 586 W/m2".
Ah, so 50% further away from the sun and thin atmosphere means colder *regardless* of co2?
But what about Venus? Roughly same mass as earth and empty of life. A co2 and N atmosphere so thick they claim one would have to be 50km up to get even "earthly extremophile" temp and pressure? Could it have something to do with "a hellish landscape of violent volcanoes" venting gasses and heating the surface from *inside*?
Add twice (1.9) the insolation, as closer to the sun, no magnetic field to protect it, and no wonder its cooking, phew.
Next stop Mercury!