The carbon that was geologically sequestered over many millions of years is being oxidized and dumped onto tjw atmosphere in decades. When all that was in the air before, the sun was in an earlier stage and emitting much less energy (30% less prior to the beginning of biology). Later on, when only a fraction of it was in the air and the sun was only a few % weaker, there were tropical forests on Antarctica and much of the tropics were uninhabitable deserts - or under several hundred feet of seawater.
But you should already know that. Why?
Because it's a PRATT!
Carbon dioxide is vital for life. Emitting CO2 adds to the biosphere. We're returning fossil carbon to the air because that's where it belongs.
The early part of the Carboniferous was mostly warm; in the later part of the Carboniferous, the climate cooled.
lyin'brian just likes to repeat the same outrageous claims over and over just to get a response. Probably turns him on.<quoted text>
Average global temperatures in the Early Carboniferous Period were hot- approximately 20° C (68° F). However, cooling during the Middle Carboniferous reduced average global temperatures to about 12° C (54° F). As shown on the chart below, this is comparable to the average global temperature on Earth today!
Similarly, atmospheric concentrations of carbon dioxide (CO2) in the Early Carboniferous Period were approximately 1500 ppm (parts per million), but by the Middle Carboniferous had declined to about 350 ppm -- comparable to average CO2 concentrations today!