No good evidence for a “greenhouse gas effect”, GHE, exists. It’s supporters bypass scientific discussion of the GHE by demonising skeptics with labels like “shill” (you work for the fossil fuel industry), and “denier” (you support fascists). They avoid talking about fundamental science at all costs. Avoidance of scientific discussion is a common feature of authoritarian politics and scams. In 2007 - 2009, Gerlich and Tscheuschner (G+T 2009) wrote a scientific monograph explaining why a greenhouse gas effect is not a scientific proposition. Their monograph goes unanswered 12 years later.
Let’s look at what this GHE claims. It says the surface of earth is 33°C warmer due to our atmosphere. In particular due to the greenhouse gases (GHG), especially the 2 main ones: carbon dioxide, CO2, and water vapor in our atmosphere. It says that the CO2 warming part, is about a quarter, and was 8°C when CO2 averaged 280 ppm in the atmosphere. It says only a change in CO2 (and other trace GHG such as methane) 'is forcing'; that water vapor greenhouse effects are not forcing but they 'amplify' the CO2 effect.
There is no scientific evidence for any of this. It is a fairy story. Environmentalists, and science activists, basically, made it up. Let us consider what scientific evidence is and ideas are, and what separates a scientific idea from pseudoscience. Richard Feynman and Karl Popper explain it well. Specifically: 1) every idea, conjecture, hypothesis, model and theory in science must be grounded in fact. It must be testable against real world observations and/or experiment. An idea grounded in logic is not scientific unless every aspect of the idea resists falsification. Falsification is a process where we take projections (we look at what the idea predicts), and compare those projections with reality. With falsification, we specifically take a skeptical attitude towards the idea (like I'm doing now), and attempt to invalidate it (like a disproof). Scientists do this all the time. Falsification is part of the lifeblood of science. That's what G+T 2009 is. Rather than embracing falsification attempts as good scientists should, the establishment began a culture war against good science to keep their fake greenhouse gas effect. They call legitimate falsification claims 'denialism'. The effect of the culture was is to avoid scientific discussion at all costs so that the establishment, money interests, behind renewables have no critics; all critics and skeptics are demonized, and sometimes cancelled.
The function of the culture war is to polarize society so far such that an issue becomes extreme politics; which, basically, define a position. Unless one betrays one's party one cannot question its fundamental precepts. Global warming is a fundamental precept of the U.S. Democratic Party. The demonization of skepticism by media is Democrat activists (and their puppets and imitators) in action. To get everyone to toe the line, so that policy is justified. This was not, necessarily a conscious conspiracy. Al Gore began it, and he did everything openly. There are elements of conspricy in it; in particular, promises given in secret (e.g. email) and accepted for money. Yet in the main, it's not secret. So not a conspiracy.
How to tell whether a scientist's contribution to the greenhouse gas debate is legitimate
Simples!, just ask them to cite their attempted falsifications, or support for falsification, of the Greenhouse gas effect.
If they never tried to falsify it, they aren't even scientists, at least: not good scientists.
Notes:
- See Anthony Pagden's explanation of modern skepticism in "The Enlightenment And Why It Still Matters".
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