Brief (<100 y) rapid-increase anomalies in the Earth's atmospheric 14 C production have previously been attributed to either g photon radiation from supernovae or to cosmic ray particle radiation from exceptionally large solar flares. Analysis of distances and ages of nearby supernovae (SNe) remnant surveys, the probable g emissions, the predicted Earth-incident radiation, and the terrestrial 14 C record indicates that SNe causation may be the case. SNe include Type Ia white dwarf explosions, Type Ib, c, and II core collapse events, and some types of g burst objects. All generate significant pulses of atmospheric 14 C depending on their distances. Surveys of SNe remnants offer a nearly complete accounting for the past 50000 y. There are 18 events ≤ 1.4 kpc distance, and brief 14 C anomalies of appropriate sizes occurred for each of the closest events (BP is calendar years before 1950 CE): Vela, +22‰ D 14 C at 12760 BP; S165, +20‰ at 7431 BP; Vela Jr., +13‰ at 2765 BP; HB9, +9‰ at 5372 BP; Boomerang, 11‰ at 10255 BP; and Cygnus Loop at 14722 BP. Although uncertainties remain large, the agreements of prediction to observation support a causal connection.