It has changed so fast before the ice receded stating 11000 years ago at the end of the glacial maximum it receded in hundreds of years not thousands .I just looked at the snow fall historically for where I live data starts in 1892 zero snow then two to four feet then in 1896 over 100 inches then in1926 18 years with no snow this is weather the snow fall is random at best.we can't survive with out co2