Please give the interview a listen! I was a little late due to a scheduling mix-up, but I show up around the three minute mark. Apologies for any details I might have misstated (this is my first radio interview), but all of the main points should be right. Hopefully I get listeners interested in the fascinating and important nature of this work. As I say in the interview, proxy data are really cool!
You can read the full text of the paper we're talking about here: Nature Geoscience paper.
Also, the hosts talk a little about a companion paper that colleagues of mine (but not me) worked on, which discusses regional climate variability over this same time period, which you can find here: Nature paper.