 A lot of researchers working on oceanography and cryospheric research, the ice sheets, the atmospheric research, land use, and looking at the changes in the Holocene, and particularly this late Holocene and what people had begun to call the Anthropocene. And they put together a series of graphs in there, 24 graphs, and 12 of the graphs were looking at socioeconomic change since 1800, since the start of the Industrial Revolution.