This incorrect assertion destroys any credibility this article may have had. Increased levels of carbon dioxide come after, not before global warming! Everybody knows that except Al Gore and his paid minions!
A couple of points:
CO2 lags temperature by around 800 years or so. And what occurred around 800 years ago? Can you say Medieval Warm Period?
No, everybody does not know that CO2 comes after not before Global Warming, and that's a problem! You can tell some liberals the facts. Tell them they can look it up. They refuse! They do not want their precious bubble burst!