“The fact that greenhouse gases emitted by humans are changing the global climate system is scientifically undisputed.”
The question has always been: by how much? It may be an undetectable amount, if may be detectable but insignificant, It might even be significant.
That is the basic question: How much?
The question cannot be answered by models, because we do not know much about many feedback loops in the atmosphere.
All the models have “K”factors that are just guesses placed in them to make the model work. The number put in for “K” is adjusted to make the model look like what the modeler thinks reality should look like.
The models cannot be validated, because we do not have more than a few decades of scanty data for climate history.
All the data before that is “modeled” on assumptions about tree rings or plankton in sediments, or some such.
Even the last few decades of data seldom have accuracies to better than .5 degrees Centigrade, and much of that is routinely “adjusted” by warmists to fit their ideas of what reality should look like.
The effect is completely negligible and there insignificant. No one can even prove it CO2 makes the temperature go up or down as the accepted science is all faked.
One supervacano Blows and it will put out multitudes more CO2 than every spec of pollution Man has ever created on this earth.