Callendar had a knack for discounting data that did not support his contentions....just like pseudo scientists today.<quoted text>
How far back should I go? I guess Callendar is good enough. Look him up.
You may want to go further back, son, or fast forward.
Btw... I often wonder why he chose to ignore the 70k records of duerst, kreutz,&misra that documented tremendous increase and decrease in co2 that went counter to his "theory"!!