MUSELLA, Georgia — Georgia’s peach industry suffered staggering losses this year — 85 percent of the crop wiped out by a winter that never get cold enough for the fruit to grow and ripen properly. The lingering question: was this a harbinger of climate change and many warmer winters to come? Or was it just the sort of bad luck that Georgia farmers have seen come and go ever since people began tilling the soils here? Robert Lee “Mr. Bob” Dickey, the patriarch of a family that grows a thousand acres of peaches in Middle Georgia, doesn’t hold with this...