Why Venus is so cold

Venus is a mere 460°C, but basic radiative physics says it should be much hotter... If this kind of video interests you, check out educational website and app Brilliant, and get 20% off at https://www.brilliant.org/simonclark

In this video I look at why Venus is so cold, a paltry 460°C rather than the hundreds of thousands of degrees the greenhouse effect says it should be. With all that carbon dioxide in its atmosphere, and being so much closer to the Sun, why is Venus so cold?

LINKS
1) This number comes from this paper, which is a really useful resource on Venus all round https://link.springer.com/article/10.1007/s11214-018-0525-2
2) Note this 0.0028K figure comes from 560K/200000 (that second figure being roughly the ratio of CO2 masses on Earth and Venus), which is incorrect because the greenhouse effect on Venus is around 580K, not 560K. As we see in the video though, this doesn't change any of our conclusions.
3) See e.g. https://skepticalscience.com/why-global-warming-can-accelerate.html
4) Figure taken from the ever-excellent Carbon Brief https://www.carbonbrief.org/explainer-how-scientists-estimate-climate-sensitivity

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Music by Epidemic Sound: http://epidemicsound.com
Edited in part by Spencer Grant.

This video uses radiative physics to establish the climate of Venus, talking about how carbon dioxide generates a greenhouse effect, similar to other greenhouse gases. Yet if we are to believe the greenhouse effect of greenhouse gases on Earth, Venus is observed to be too cold!

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Видео Why Venus is so cold канала Simon Clark