Earlier quoted context omitted.
Amply and persistently debunked. See e.g. http://www.scientificamerican.com/article/seven-answers-to-c...
Which part? Are you saying the roman or medieval warm periods dont exist?
> "Even if the world were incontrovertibly warmer 1,000 years ago, it would not change the fact that the recent rapid rise in CO2 explains the current episode of warming more credibly than any natural factor does—and that no natural factor seems poised to offset further warming in the years ahead."