It's been a slow steady increase in CO2 since industrialisation.

The atmosphere has become increasingly better insulated in the thermal energy spectrum .. albeit still losing a lot of heat to the outer layers and to space.

Basic back of the envelope thermodynamics tells the story - more trapped energy at the surface layer - land, sea, and near surface air becomes warmer across the globe and that warmth cascades through energy transfers.

For some it's confusing that warmth -> rising air -> inrushing colder air -> circulating air cells -> freezing conditions (just as fridges / freezers heat pump via air pressure).

The first significant paper on this was

Thermal Equilibrium of the Atmosphere with a Given Distribution of Relative Humidity (1967)

https://journals.ametsoc.org/view/journals/atsc/24/3/1520-04...

A great deal of key data (atmospheric makeup, sea tempreture records) came from hard nosed Cold War era research focused on nuclear weapons, sub tracking, and other such pursuits .. much of it "disguised" as environmental research (we listen to whales!) but not at all driven by a 'need' to invent and justify an AGW agenda (as some have claimed).

Sure, but it's not that lucky. You can't set your house on fire by adding more and more roof insulation, it's the same here. The greenhouse effect saturates, it's not linear https://www.scirp.org/pdf/acs2024144_44701276.pdf There's also lots of feedback loops. CO2 levels were much higher in the past but life thrived, it wasn't waterworld, it was just a lot greener. So it only sounds lucky because climatologists have claimed even very tiny changes can cause a crisis.

Remember, we're talking here about a gas that makes up 0.04% of the atmosphere. Water is a much more powerful greenhouse gas. CO2 wasn't measured directly before about 1960, but if you believe the ice core measurements it was about 0.02% in 1850. It would be a very fragile planet that could be tipped into disaster by a change of 0.02 percentage points in the level of a single gas.

Climatologists have influence and funding because of their claims about temperature trends. But the records from individual weather stations are aggregated into regional and global timeseries by climatologists themselves, giving them intense conflicts of interest. If the graphs they computed wandered up and down in ways not linked to human activity they'd be no more important to the world than the people who classify beetles. So they have a strong incentive to edit the data as they aggregate it, and they do.

Climatology didn't really exist before WW2. From the end of the war to about 1975 the world was cooling. The then-new field discussed it extensively and projected the trend forward to predict a new ice age. See it by doing a historical Google Scholar search. Watch out that in the beginning they called it "climatic change" not "climate change".

https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&as_ylo...

Here's an example paper from 1973, shown in the first page of results for me but you can pick any, there are thousands and they all say the same thing: https://www.tandfonline.com/doi/abs/10.1111/j.1467-8306.1974...

CLIMATIC CHANGE SINCE 1950

Published in the Annals of the Association of American Geographers

ABSTRACT

The mean temperature for the Northern Hemisphere had a warming trend from 1890 to 1950 and a cooling trend since 1950. The eastern and central United States had colder temperatures in 1961–1970 than in 1931–1960

Claims like that are everywhere in the pre-1975 literature. Climatologists warned the US President to prepare America for a new ice age (https://realclimatescience.com/wp-content/uploads/2017/11/20...). Papers and news reports show the graphs of temperature they were using and the cooling trend is very clear. Modern temperature graphs look totally different and don't show what they were talking about. The reason is that starting around 2000 climatologists developed a culture of editing data to make it look like the world was warming. They alter the data by cooling the past and warm the present.

This has been noticed many times over the years, by different people.

Example: In 2021 NOAA announced a new global world temperature record which was lower than a previous world record they had announced. Someone queried this and NOAA told them that the temperature time series is a "reconstructed dataset", meaning every time they add a new month's data they recompute the entire historical record. This is a nonsensical violation of causality but the statement was attributed to their "climate experts". https://retractionwatch.com/2021/08/16/will-the-real-hottest...

Example: In the first decade of the century, the practice of changing temperatures was still new and rare, but recorded temperatures had stopped going up. For a few years climatologists did nothing in the hope the unpredicted pause in global warming was temporary but it continued. By 2013 Der Spiegel was reporting on the "crisis" in climatology. "Data shows global temperatures aren't rising the way climate scientists have predicted. Now the Intergovernmental Panel on Climate Change faces a problem: publicize these findings and encourage skeptics -- or hush up the figures." https://www.spiegel.de/international/world/climate-scientist... Two years later they chose to edit the databases to delete the pause and asserted it had never happened: https://bibbase.org/network/publication/tollefson-climatecha...

The temperature record has been fake for a long time. No claims about temperature records can be trusted because they might change their mind about how hot it was on a certain day retroactively, years later.

Thinking that anyone who disagrees with you isn't real sounds concerning. You should see a psychiatrist about that, in case it gets worse.

Anyway. You say skeptics will vanish when we "really start" to feel the impact of it. When? Pick a date. Man up, commit. Because everyone who picked a date in the past had their beliefs invalidated. The skeptics win, every single time.

https://web.archive.org/web/20100113183137/https://www.indep...

March 2000. According to Dr David Viner, a senior research scientist at the climatic research unit (CRU) of the University of East Anglia, within a few years winter snowfall will become "a very rare and exciting event". "Children just aren't going to know what snow is," he said.

You ask why. How about, because truth matters. How about, because the mitigations climate Kool-Aid drinkers demand are economy-cripplingly expensive. Those two alone are good enough reasons for anyone.

There are very long-term culture wars, from before the term was invented. Consider:

* Hippies. They were great in many ways, but also fucking stupid, man.

* The New Age movement of the 90s, obsessed with dolphins and crystal healing and mystic composting toilets, and anti-human except when the humans sit in drum circles. Actually these days I've come to quite appreciate the music of Enya. But this cultural movement was also fucking stupid and very enamoured of performative environmental concerns, which fed into a sort of industry of selling concerns to New Agers. There was a lot of guilt tripping involved for anybody who wouldn't recycle, or whatever. So naturally that made me highly suspicious and unreceptive.

* The climategate email scandal of 2009. This one actually swayed me in favor of climate scientists, because I got to see what the emails from inside the echo chamber looked like, and to see how badly they were behaving when motivated by their careers and status, and actually the answer was "not all that badly", and the massaged figures, though shameful, weren't all that massaged, and their attitudes, though biased, were actually fairly sincere. But they were part of a biased "us against them" sort of struggle, where they wanted belief.

So you get ongoing skepticism just because of, you know, backlashes, pushbacks, people rightfully wanting to be independent thinkers in the face of other people who apparently want them to conform mindlessly. The idea that it might all be a popular delusion is plausible because there's always been a lot of popular delusions around, so you've got to respect analytical doubters, if they truly are analytical.