[cogitator]

So, according to these folks 400 years ago the temperature was even higher

No, it could have been considerably colder 400 years ago. The correct interpretation is that in the period from now to 400 years ago, it was never (at any time) warmer than it is now.

[saleman]

"Surface temperature reconstructions for periods prior to the industrial era are only one of multiple lines of evidence supporting the conclusion that climatic warming is occurring in response to human activities, and they are not the primary evidence."


So the reconstructions are wrong, but it doesn't matter because there is other evidence? Well, if they are wrong why do folks keep using the models as if they were gospel?

Also, what is the "primary evidence" that human activities are causing global warming?

I know you have been around here long enough to know that most here don't believe that humans are causing global warming. We're probably split as to whether the earth is warming at all. But if you have more than anecdotal evidence or speculation that people cause global warming I would be happy to see it.