While this has some technicalities, critiques of climate change alarmism, and hence zero net, are important enough to grin and bear a few technicalities. A newly published paper by Demetris Koutsoyiannis (link below), argues that the familiar thirty-three-degree gap between Earth's effective radiating temperature, about 255 K (Kelvin to Celsius: Subtract 273.15 from the Kelvin value ), and its actual surface temperature, about 288 K, is not mainly the work of carbon dioxide or of longwave radiation trapped in the air. It is the work of convection (heat transfer through objects), and of the lapse rate that convection produces.
Surface temp ≠ f(CO2), but Surface temp = f(convection → lapse rate)
That is a direct challenge to the way the greenhouse effect is usually sold. The usual story says infrared-active gases raise the altitude from which the planet can radiate to space, and that the surface must then sit warmer so the energy budget still closes. Koutsoyiannis's story says the warm surface is what you get when a convective atmosphere is allowed to establish a temperature gradient from a cold emitting region down to the ground. Without convection there is no lapse rate. Without a lapse rate there is no simple mechanical reason for the surface to sit above the column-mean temperature.
The lapse rate itself is not mysterious. Rise through the troposphere and the pressure falls; the air expands and cools, on average by about 6.5°C per kilometre on Earth. Kilimanjaro wears snow near the equator because its summit is tens of degrees colder than its base. That gradient is fluid dynamics. The paper's claim is that this gradient is not a side-effect of a radiative greenhouse but the thing doing the lifting. "The warming from about 255 K to about 288 K," it says, "is a necessary consequence of the lapse rate, which in turn appears because of convection."
From there the causality flips. Mainstream talk treats extra trapped longwave as the cause and temperature as the result. The paper treats temperature as the cause and the longwave field as the result: the temperature variation, it says, fully explains and predicts the variation in outgoing longwave. If that is right, radiation is closer to a thermometer than a thermostat. The same text claims the lapse rate is effectively invariant to changes in longwave. If the slope does not move when you change the radiation, you cannot hang the surface temperature on radiation alone.
The naming argument follows. A garden greenhouse warms in part by suppressing convection: glass stops the warm air leaving. Earth's troposphere does the opposite. It runs on convection, and that convection sets the slope that puts the ground above the column average. Calling the result a "greenhouse effect," the paper suggests, is backwards. "Anti-greenhouse" would be the more accurate term, not because the planet is cooling, but because the mechanism is the reverse of a closed glass box.
Venus is the usual courtroom exhibit for carbon dioxide as the knob: a ninety-two-bar sky, almost pure CO2, a surface above 700 K. Koutsoyiannis treats that exhibit as weaker than advertised. Over Maxwell Montes the pressure falls from roughly 92 bars to about 45, and the temperature falls by about 82°C. That is a lapse-rate signature. The troposphere there sits close to the dry adiabatic, about 10.5 K per kilometre, which is what you expect if convection dominates the column.
Venus surface temp ≈ f(pressure × lapse rate)
Carbon dioxide is abundant. The paper's point is that abundance is not the same as the control variable. Pressure and the convective profile are doing the visible work of turning a high lid into a hot floor.
The framing is powerful because it is easy to picture. Hot air rises. Pressure drops. Temperature drops. Mountains are cold. Two planets, same slope logic. If radiation is downstream of temperature, carbon dioxide shrinks from prime mover to participant. That is why the piece offers: it offers a mechanism you can point at, not only a correlation in a model.
It still has to fight on ground the consensus will not yield. Energy balance is not optional. Whatever the lapse rate does inside the column, the planet has to shed the sunlight it absorbs, and that dump to space is radiative. Convection moves heat; it does not invent the joules. Laboratory spectra of CO2 are not a committee vote. And the lapse rate is not a granite slab. Moisture, cloud, and humidity shift it, and those quantities respond to temperature and composition. The hinge of the whole construction is the height and temperature of the emitting level. Opacity helps set that hinge. A slope without a hinge is just a line.
So the strongest version of the claim is not "carbon dioxide does nothing." It is that the textbook habit of attributing the surface–emission gap almost entirely to a radiative greenhouse overstates the gas and understates the convective structure, and that Venus, read as a pressure-and-adiabat machine, is less of a unique CO2 parable than the slide decks imply. That is a narrower, testable position. It is also enough to unsettle the "control knob" slogan, which is the version of the science that actually drives policy talk of zero net.
https://www.mdpi.com/2076-3263/16/9/371