A new paper in Nature reports that the temperature-leads-CO2 effect seen in the Antarctic ice cores reverses when the analysis is extended to the globe as a whole (report here).
The new data is from northern hemisphere ice cores and proxies from other places around the globe.
A new, detailed record of past climate change provides compelling evidence that the last ice age was ended by a rise in temperature driven by an increase in atmospheric carbon dioxide.
The finding is based on a very broad range of data, including even the shells of ancient tiny ocean animals.
According to the BBC report, "the study covers the period in Earth history from roughly 20,000 to 10,000 years ago".
Lots of questions occur:
Interesting stuff.