G. Alex Sinha

It is commonplace to observe that digital technologies facilitate our access to information on a scale unimaginable in previous eras, leading many to call this the “Information Age.” The vaunted advantages of unprecedented data flow obscure a dark corollary: the more modes of engaging with data are available to a people, the more modes are available for manipulating them. Whether through social media, blogs, email, newspaper headlines, or doctored images and videos, the public is indeed bombarded by information, and much of it is misleading or outright false. Much of it, in fact, is propaganda. As the methods for manipulating mass audiences continue to multiply, a clear understanding of the concept of propaganda has never been more relevant. This Article constructs a precise, novel account of propaganda, incorporating notable scholarly insights into the concept as well as the overlooked lessons of the law’s fragmented efforts to regulate it. To bring this new theoretical framework into focus and demonstrate its importance in the Information Age, the Article connects the underlying theory to contemporary communications practices, many of which are enhanced by the availability of new technology. Notably, in doing so, the Article also develops the first systematic account of political gaslighting, which properly understood (and counterintuitively, perhaps) constitutes a form of propaganda.

Precipitation in southwestern North America has exhibited significant natural variability over the past few thousand years. This variability has been attributed to sea surface temperature regimes in the Pacific and Atlantic oceans, and to the attendant shifts in atmospheric circulation patterns. In particular, decadal variability in the North Pacific has influenced precipitation in this region during the twentieth century, but links to earlier droughts and pluvials are unclear. Here we assess these links using δ 18 O data from a speleothem from southern California that spans AD 854-2007. We show that variations in the oxygen isotopes of the speleothem correlate to sea surface temperatures in the Kuroshio Extension region of the North Pacific, which affect the atmospheric trajectory and isotopic composition of moisture reaching the study site. Interpreting our speleothem data as a record of sea surface temperatures in the Kuroshio Extension, we find a strong 22-year periodicity, suggesting a persistent solar influence on North Pacific decadal variability. A comparison with tree-ring records of precipitation during the past millennium shows that some droughts occurred during periods of warmth in the Kuroshio Extension, similar to the instrumental record. However, other droughts did not and instead must have been influenced by other factors. Finally, we find a significant increase in sea surface temperature variability over the past 150 years, which may reflect an influence of greenhouse gas concentrations on variability in the North Pacific.