That is an antiquated chart.
Before you try a character assassination of the author, the below article was written by one of your alarmist. She fully believes in global warming and thinks current CO2 levels doom the earth to 5 degrees of warming.
However, WHERE IS THE WARMING?
Evolution of global temperature over the past two million years
Nature (2016)
Received 27 January 2016 / Accepted 24 August 2016 /Published online 26 September 2016
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature19798.html