Venus Missing Greenhouse Warming

Omniclimate – Venus Missing Greenhouse Warming

“Let’s compute (in a simplified manner!) what would happen were Earth suddenly equipped with an atmosphere as massive as Venus’ (ie 90 times more than ours).


Given the similarities in mass and diameter of the two planets, we can assume this new atmosphere would behave similarly to Venus’, and in particular, purely adiabatically below 60km (instead of below 12km as at present).

For another simplification, let’s also imagine the new atmosphere to be just as our current one but without any water.

The lapse rate for dry Earth atmosphere is known and is 9.760 K/km.

How higher would the surface temperature be, with a dry atmosphere and a 60-km-thick troposphere?

9.760 * (60-12) = 468K higher than at present (288K)

The total for Earth is then 756K. Compare that to Venus’ surface temperature of 735K.

For an amazing coincidence, that’s 97% of the above, whilst the ratio of absorbed Solar radiation at Venus compared to Earth is… 96%.


Note how the increase in temperature doesn’t depend on any greenhouse gas.

And so do we really need to believe in greenhouse warming when mere mass can explain the observations?”

Jo Nova on Venus

This is it, get ready, the leading line dealing with the paramount point: How do we know CO2 matters?—tell me if you’ve heard this before…—’Venus’.

Watch him set himself up for a ridiculous leap of logic:

“Though [Venus] shares several features in common with our planet, hence its sometimes being called Earth’s “sister planet,” it differs in one crucial aspect: the amount of CO2 in its atmosphere.”

Whoah. Differs in just the one aspect? One? Haul out the old world book encyclopedia and find out that Venus is also 40 million kilometers closer to the sun; it spins backwards; a day lasts longer than a year; it has an atmosphere 90 times denser than earth, and it’s hot enough to melt lead on the surface. All this, AND the clouds are made of sulphuric acid.

It’s one hell of a ’sister’ with acid rain at 475 degrees. (Don’t park the Ford there, it’ll be gone tomorrow. Part gas. Part liquid.)

Jacquot ‘reasons’ (I’m feeling generous) that because the atmosphere on Venus is almost totally CO2 and the planet is hot, therefore, CO2 made it that way. But correlation is not causation, and sadly for the him this reason disappears faster than the interplanetary Ford. Let’s pick just one difference. With an atmosphere 90 times denser than Earth, Venus is ‘like’ the earth in the same sense that Bruichladdich Whiskey is ‘like’ water. They’re both clear liquids, but one will sterilize your bench top.

If Earth were wearing a three blanket wrap, poor Venus lucked out with a 270 layer  equivalent. No wonder it’s hot.

On Earth, to get the same atmospheric pressure as Venus you need to get down about a kilometer below sea-level, and I don’t mean a kilometer down a mine shaft, I mean almost a kilometer below sea-level, or under the weight of 900m of water—go sit in a deep sea trench. If you went down a mine shaft, to get true equivalent ‘air-pressure’ to Venus, you’d need to be about 50 kilometers underground, which is 40 kilometers deeper than anyone has ever dug. There is no place on Earth like Venus.

Thanks to the super thick atmosphere, Venus is bound to be hotter no matter what gas it has up there. Ninety times! If Earth were wearing a three blanket wrap, poor Venus lucked out with a 270 layer equivalent. No wonder it’s hot. If you want to explore some numbers try this.

The next time a warmist yells Venus. Just yell back Mars. Its’ atmosphere is 95% carbon dioxide and yet, oops – it’s not 400 degrees, instead, it’s minus 40. The warmists with half a brain might come back at you with the explanation that Mars’s atmosphere is thin, but that’s just fine. That IS the point really isn’t it? Mars is cold because it’s atmosphere is so thin, and for exactly the opposite reason, that’s why Venus is Hot.

Stuck in a pit of poor reason, Jacquot keeps digging:

“In fact, many of its unique characteristics can be attributed to the fact that its atmosphere has such a large mass of CO2—roughly 97 percent of it.”

This is just plain sloppy. Many of it’s attributes? So now Venus has some differences to earth, but instead of crippling his ‘evidence’ they’re somehow due to the CO2? Name one. (And then explain how any of this is connected to The Skeptics Handbook).

What’s really depressing though, is that Jacquot claims he got this from a professor. (Ouch-really? There’s a university that gives out professorships for people who make basic mistakes in reasoning?).

The problem with this kind of assertive ill-mannered non-reasoning is that casual lazy readers soak it up.. . it becomes the daily dog food of those who want their beliefs on Global Warming shored up.

Jeremy acknowledges a few differences in the sibling planets… but he says, “it does demonstrate that there is a link between higher CO2 and higher temperatures”. Yes indeedy. That’s a ‘link’ with analytical power like the link between GDP and Santa. (Look out: nations that Santa visits are wealthier than those he skips over. So, let’s do Christmas twice a year and improve national productivity? Heck-let’s do Christmas every day. You can use this kind of reasoning to justify anything you can think of. Want to connect dairy products to scientific paper production? Look at national rates of Diabetes type II. It does wonders for national peer-reviewed scientific output. Countries without insulin resistance hardly publish anything. I can see the campaign: “Butter for Botswana—improve scientific research.” )

Yes, Jeremy, the link between CO2 and temperature that has analytical power is well known. On Earth, higher temperatures raise CO2.

This is exactly the muddy, poor quality science communication and dismal reasoning that got us into trouble in the first place. Jacquot claims sceptics are ‘muddying the debate’, but he thinks it’s ok to brush dozens of variables under the carpet of  one ‘not quite perfect’ argument to demonstrate a specious ‘link’? This is either inept or dishonest, or both.


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