OK, now I have read the second link regarding the Eocene-Oligocene climate transition.
It was definitely immediately subsequent to the major boloid strikes of the 34 to 35 million year ago period. The Chesapeake Meteor and Popigai both left craters 60 miles in diameter, and the Toms River meteor left a crater almost 10 miles in diameter. This was more than enough to cause a nuclear winter type event with the formation of a major Antarctic ice sheet. As to what influence this had on the state of CO2 is not addressed, but since they did not even mention these boloid events in the article it does not make sense to make any major attributions to CO2 and temperature causation.
I couldn’t find “Toms River meteor” on Yahoo or Google. What’s up?