Use "retrogression" in a sentence

1. 17 Especially in the near decades, these reasons result in a series of ecological problems, such as pasture retrogression, vegetation sparsity , soil erosion and dust devil.

2. War is old--Atavistic, a confession of failure, evidence of retrogression. CLASS OF '29 ORRIE LASHIN AND MILO HASTINGS The probability, in this case, is that the Atavistic variety will find its way into a pie, instead of being kept as a pet