I have a National Parks guide to Grand Teton National Park, written in the 80’s before they started this GW nonsense.
The guide says the glaciers have been receding since at least the mid 1800’s and eventually will be gone by natural processes.
A few years ago, I drove the Icefields Parkway. This is a highway from Jasper National Park to Banff National Park in Alberta (and as an aside, the most beautiful drive in North America). Approximately half way along this drive, one passes the Columbia Icefields - there are a number of glaciers here but the one that is featured with a visitors' centre and snow cats that will drive you up the mountain is the 4 mile long Athabasca glacier. The glacier is receding and there are markers at various points that show where it was located in years past. While I was there, I got into a discussion with some folks there and they were bemoaning the effects of 'glowbull warmongering' and how the ice recession demonstrated this so clearly. Shortly thereafter, we were in the visitor's centre where they show pictures from years gone by.... I quickly pointed out to these folks that the movement of ice up the mountain was essentially consistent and had been since the first recorded visit to the area in (and going on memory here) approximately 1850. Glowbull warmongering? I doubt it unless you want to believe that GW has been happening virtually consistently since at least 1850.... http://www.explorerockies.com/columbia-icefield/