mP,
Looked at your charts above. I don't understand your last one, but I can draw some conclusions from your charts from Antarctica (Vostok).
Since the present is "zero" on the independent axis and it tracks for about 250,000 (?) years, it appears that temperature and CO2 track very well. Dust seems to do what it wants.
As to other mechanisms, there is a long term eccentricity variation in the earth's orbit, the perihelion shifts in inertial space cyclicly, and the polar axis precesses over about 25,000 years... But the semi-major axis is not wont to change much. So in effect, you can have extremes in the southern and northern hemisphere. Currently we have a near circular orbit, but with northern summer at aphelion rather than perihelion. The measures over 250,000 years could represent some cycles where southern hemisphere summer occurred at perihelion in an eccentric orbit. I don't know that. Yet data I've seen for the 20th century indicates that CO2 levels trace closely at Vostok and Hawaii with summer-winter variations. Also, sea temperature increase results in loss of CO2 storage capacity. And that's one reason for concern.
The trouble is, the chart does not go all the way to the present time. CO2 concentrations are ~380 ppm; not 300. First time I saw that data was in a circa 1978 atmospheric science text starting from the 19th century. Extrapolating to the current day was linear. But if you looked at it on the scale of the graph you supplied, you might call it exponential. I don't know what the Antarctic temperature is currently, but there have been some Rhode Island size icebergs calfing from the ice shelves lately.