Proudpatriot, a quick google search reveals graphs of historical carbon dioxide concentrations.  All atmospheric carbon dioxide levels for the past 800,000 years are below the current atmospheric carbon dioxide levels.  So, your statement is without merit.  https://www.google.com/imgres?imgurl=https://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Carbon_Dioxide_400kyr.png/380px-Carbon_Dioxide_400kyr.png&imgrefurl=https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%2527s_atmosphere&h=276&w=380&tbnid=KO5hLoRslWhZxM:&tbnh=152&tbnw=211&usg=__f2iRq73JzWfPoQdzXhfv8MBjjcw=&vet=10ahUKEwjbj77X9sLTAhVVzWMKHdU7D64Q9QEIKzAA..i&docid=xiDTYec4fdqOoM&sa=X&ved=0ahUKEwjbj77X9sLTAhVVzWMKHdU7D64Q9QEIKzAA#h=276&imgdii=JPkr75Bx65Z18M:&tbnh=152&tbnw=211&vet=10ahUKEwjbj77X9sLTAhVVzWMKHdU7D64Q9QEIKzAA..i&w=380