Based on Earth’s recent geologic history, claiming that CO2 concentration causes warming is like arguing that geese cause temperatures to fall by flying South.Here's the whole article. I've seen a similar graphic before but if anything this one suggests that periods of significant global warming might be triggered by the CO2 level falling to about half of what we're seeing today. When global temps fall they eventually (8000 years or so) drag the CO2 levels down with them.
Monday, December 29, 2014
It seems to happen without any help from CO2. In fact, CO2 seems to be a lagging indicator of global temps.