It is one of those things that is a terrible supervillain type idea. Ill founded and very prone to be hit the worst way by the law of unintended side effects. But it is also fun to think about as a sort of evil what if.

Volcanoes emit a lot... I mean an extreme amount of co2. They are also associated with global cooling events. This does not match general greenhouse carbon theory. So you go digging in to find out why. and the answer is complex but one major reason is that they also emit a lot of sulfur dioxide and sulpher dioxide has a negative greenhouse coefficient. that is, when found in the upper atmosphere it has a net cooling effect.

So you do a little mustache twirl, give an evil cackle, and proclaim "It is a shame we worked so hard to remove sulfur from our fuels." I mean acid rain was not really all that bad, was it? When really in the mood I also like to conclude with "The obvious thing to do is to add additional sulfur into jet fuels"

The final fun thing to do after you have just become an internet expert(that is you read the wikipedia page) on greenhouse theory. Is to inform people that water vapor has 10 times the greenhouse coefficient of co2. I will leave it to the reader to figure out why this both is and is not a problem.