In 1938, English steam technologist Guy Stewart Callendar wrote what proved to be a seminal – one might even venture to call it the foundational – paper of the entire modern AGW pipe dream movement, with its rather determined effort at postulating what we today call the “Radiative (Atmospheric) Greenhouse Effect” (rGHE), or as some people would prefer it: the “Callendar Effect”.
In his paper – “The Artificial Production of Carbon Dioxide and Its Influence on Temperature” – Callendar argued that the increase in global atmospheric CO2 concentration due to our industrial endeavours would (and did) warm the world because of the alleged augmenting influence of this IR-active molecule on the so-called “sky radiation” (what we today call “(atmospheric) downwelling longwave radiation” (DLR, DWLWIR), more commonly known simply as “back radiation”):
“Few of those familiar with the natural heat exchanges of the atmosphere, which go into the making of our climates and weather, would be prepared to admit that the activities of man could have any influence upon phenomena of so vast a scale.
In the following paper I hope to show that such influence is not only possible, but is actually occurring at the present time.”
Notice here how Callendar was well aware that with his hypothesis, he was challenging a generally accepted scientific paradigm of his time, one which held that our climate and weather are natural phenomena with purely natural drivers, which can not in any meaningful way be influenced (globally, at least) by human activity.
Callendar claimed that it can. And that it does. He even went so far as to claim he could show it …
Well, then; by all means bring it on! To quote Carl Sagan:
“Extraordinary claims require extraordinary evidence.”