"it doesn't support anthropogenic global warming. "
Yes it does when you match it to the CO2 readings for the last 150 years. Which by the way have just gone over 400 parts per million - for the first time in the last 20 million years.
"Presumably something stopped the little ice age"
Presumably you need to Bing Maunder Minimum.
"that correlation between the two appears to have broken down in the last 15 years"
No - no it doesn't. The correlation is still well within existing historical variations.
"I doubt there was enough CO2 released in the 18th & 19th centuries to be the cause of that temperature rise"
Sounds very scientific.
That a) global warming is happening and than b) it is at least significantly anthropomorphic in nature have not been in any scientific doubt whatsoever for at least a decade now. You might want to argue about the impacts or what to do about, it but denying it is happening and that we are at least partly to blame is simply laughable.
nb - we are also now statistically about 99% sure that man is not just a significant cause, but is the primary cause of global warming.