1. Time lag disproves causality - true, but irrelevent, past changes driven by temperature caused co2 changes. This time we are driving with Co2 and causing temp changes. Coupled system - both effect each other. This is not good news as CO2 begets more temp which begets more CO2 and so on, also these changes happen much slower in past so who knows what happens this time when ocean thermal reservoir catches up.
2. H20 vs CO2. Yes lots more water - difference is that there arn't oceans of CO2 lying around H2o is in equilibrium with liquid water. We couldn't have any effect on H20 concentration directly if we tried. It would rain out if we added it or evaporate out of oceans if we took it out. CO2 on the otherhand is just the right powerful lever to pull and we are yanking it like it's never been yanked before in the history of earth - certainly since mammals were evolved anyway. CO2 also begets H2O which aggreed is most of the greenhouse effect. CO2 is a forcing H2O is a feedback.
3. Viking farm anecdotes. Climate changes - this was not a global phenomenon, and is interesting but doesn't disprove AGW.
4. So you are arguing the point about the temperature record on earth but you think that there is sufficient data on mars global temps to make that statement and use it to disprove AGW (one of the greatest scientific efforts ever) ? Thats just silly.
They have done due diligence but unfortunately - we have to watch the earth get stuffed seriously and rub your face in a post civil society - stuffed planet for you to get it. Plus we actually have to get it before major problems happen because of the decade time lags between action and response in the climate system and the political, engineering time lags, and tipping points.
Some of these points were probably worthy of discussion during the early 1990s.
Maybe this is one of the most important subjects out there and is worth more of your time investigating than just learning enough to parrot other ignoramuses.