Look up "Runaway greenhouse effect". Think, "Venus".
Is that likely? No.
Is that more or less likely than a rogue superintelligent AI? Well, we have one example of the first and none of the second...
Is that likely? No.
Is that more or less likely than a rogue superintelligent AI? Well, we have one example of the first and none of the second...
The carbon that we're digging up was in the atmosphere before, it has just been sequestered, we're returning to a state that the Planet has seen before.
Across the entire Earth's history we're still at a fairly cold point and a long way from "Greenhouse Earth" and the temperatures at the Eocene Optimum.
And according to the IPCC: "a 'runaway greenhouse effect'—analogous to [that of] Venus—appears to have virtually no chance of being induced by anthropogenic activities"