Historically, today's temperature trends are entirely within in the realm of what has taken place in the past from natural temperature variation, regardless of CO2 levels. (c3headlines.com)
I'm simply pointing out that we know historically that CO2 changes tend to follow and are positively correlated with natural temperature changes. (illconsidered.blogspot.ru)
The shaded region in figure A shows, very approximately, the range of recent natural temperature fluctuations on 1,000 - year time scales. (usask.ca)