"Given CO2 has probably never been this high since humans evolved, who knows what other impacts it might have."
"When you look at the release today of the Australian 2012 State of the Climate report that say that we haven't had CO2 at these levels since 800,000 years ago, and with your article I went back and looked at what we may have looked like around 800,000 years ago."
So which one is it?
