[CyborgCabbage]

Well I guess that's it for climate science, no weather stations before 1850. Tree rings? Ice cores? People writing down "wow there was no rain for 3 months our God must be pissed"? Sorry, doesn't count I'm afraid.

I'm sorry for being unprofessional but this comment really struck a nerve with me. The idea of trying to move climate science into the domain of the unprovable/undisprovable by claiming that there is simply no way to have data from before 1850. Do you have a specific problem with tree rings? Their statistical significance? A confounding variable that has not been taken into account?

[shrubble]

Did you read the article? Since that is what the author refers to as his data sources' time periods, multiple times.