It's interesting that you chose that link to illustrate your point. The only thing Glacier NP did wrong was being overly-pessimistic. But anyone that has been t

It's interesting that you chose that link to illustrate your point. The only thing Glacier NP did wrong was being overly-pessimistic. But anyone that has been to Glacier in, say, 2010 or prior can visit today and see quite visibly noticeable differences. I'm hardly qualified to give even a half-assed prediction, but it wouldn't surprise me much if it turns out that Glacier NP was just 10 years off in their prediction, and I certainly wouldn't expect to see much in the way of glaciers in 2040. Glacier NP isn't the only place that I've looked up and wondered, "wasn't that a lot bigger when we were here ten years ago?", either.