the entanglement of human health and global climate change is rapidly manifesting itself in a raft of “known unknowns”—future disruptions we can reasonably forecast without yet knowing the precise form they will take or the extent of their consequences. When extended for a prolonged period of social time, such certain uncertainty breeds fear and a narrowing of intellectual and emotional attention.

What is more, these advances have notnarrowed the gap between what is known and what can be seen to lie beyond thescope of present understanding and technique; rather, each advance has madeit clear that these intellectual horizons are far more remote than was heretoforeimagined.