There was a time when a company like Volkswagen could commission various luminaries to write letters to the future, then publish them in Time magazine as part of an ad campaign. In fact, that time wasn’t so very long ago: it was the year 1988, to be precise, when no less an optimistic (or optimistically bleak?) novelist than Kurt Vonnegut was still active. At some point between writing Bluebeard and Hocus Pocus, he composed a missive directed toward humanity a century hence (in 2088), which you...