isappearing Glaciers. Global climate has changed rapidly with an average increase in 1.5 degrees F over the past 100 years. While this number may seem insignificant, noticeable changes have occurred in the glaciers in the park. In 1850 the park had 150 glaciers. By 1966 this number had dropped to 50 glaciers. As of 2009, 26 glaciers remained. Download the Grinnell Glacier spreadsheet and use it to fill in your answers to the following questions. a. Of the 150 glaciers in the park in 1850, what percentage remained in 2009? b. What is the percent decrease in the number of glaciers from 1850 to 1966 and from 1850 to 2009