[Intolerant in NJ]

...glaciers have shrunk by an average of more than 30 percent since the beginning of the last century...the average temperature did rise about one degree during the last century - during the first half of the period - they're probably "retreating" less rapidly now than they were fifty years ago......

[Williams]

Find it interesting that all these measurements involving melting that started about 100 year ago. I assume that's a trend from before the massive production of greenhouse gases.