Willem Post - "Recent swings are the Roman Warm Period, the Dark Ages, the Medieval Warm Period, the Little Ice Age, and the Present Warm Period with almost NO change in CO2 ppMv, except since about 1900; i.e., other factors are operative."
Of course other factors are operative. NO-ONE claims that CO2 is the only driver of climate. Even assuming these climate swings were global, which there is no evidence for, there are many factors affecting the climate and climate scientists are the first to include them.
"The soot and aerosols emitted by manmade processes influence cloud formation, the climate and the weather and may deduct from the LIA GW in some regions and add to LIA GW in other regions, such as the Arctic, where, due to soot deposition from increased fossil combustion by China and India, there has been increased melting of the sea and land ice."
The current climate change is called "Anthropogenic" because it is caused primarily by human factors. You are completely inconsistent here. Are you saying that soot and aerosols are causing the warming? If so you are just shifting the cause from CO2 to man made aerosols. Again I do not expect climate change deniers to be consistent however it is nice when they are.
"The American Indians inhabited the US and Canada for about 12,000 years, i.e., before the ice started to melt, and they survived significant climate change, including the 14 warming and cooling periods of the past 10,000 years, with only their primitive means, until Europeans arrived and spread chaos and disease and nearly wiped them out."
I am sure they did however they had plenty of room to move around in and low population, neither of which is the case now. How many climate refugees do you think the USA could take or where does the population of the USA go?
"Whereas it simplifies the PR message of GW activists and renewables promoters to focus on a single GW villain, i.e., CO2 emissions being THE culprit regarding GW, the real situation is entirely different and much more complex. Many other factors, natural and manmade, affect the WAT and the climate."
It does not simplify the message nor is CO2 and other greenhouse gases cited as the problem to 'simplify' the message. You are correct that the problem is complex however greenhouse gases, when the calculations are done, account for the recent warming far better than anything else. Again please present the peer reviewed evidence you have to the contrary.
"but it is grossly misplaced and grossly wasteful, because, according to measured data, the contribution of CO2 to GW appears to be minor."
Not according to the peer reviewed literature. Human emitted greenhouse gases are the major driver of recent warming.
Please at least read the following link that does cite the research behind these conclusions: