"The centerpiece of the visitor center at St. Mary near the east boundary is a large three-dimensional diorama showing lights going out as the glaciers disappear. Visitors press a button to see the diorama lit up like a Christmas tree in 1850, then showing fewer and fewer lights until the diorama goes completely dark. As recently as September 2018 the diorama displayed a sign saying GNP’s glaciers were expected to disappear completely by 2020.
"But at some point during this past winter (as the visitor center was closed to the public), workers replaced the diorama’s 'gone by 2020' engraving with a new sign indicating the glaciers will disappear in 'future generations.'
"Almost everywhere, the Park’s specific claims of impending glacier disappearance have been replaced with more nuanced messaging indicating that everyone agrees that the glaciers are melting. Some signs indicate that glacial melt is 'accelerating.'
"...some of the most famous glaciers in the park have actually grown in the last decade: Teams from Lysander Spooner University visiting the Park each September have noted that GNP’s most famous glaciers such as the Grinnell Glacier and the Jackson Glacier appear to have been growing—not shrinking—since about 2010. (The Jackson Glacier—easily seen from the Going-To-The-Sun Highway—may have grown as much as 25% or more over the past decade.)"
Link: Experts