Before and after photos show how glaciers have totally melted over the years

ball-shaped thaw is melting the world . Here are picture collect from the USGS that shows how Glacier National Parks — once home to 150 glaciers in Montana and now down to only 25 — has change over the years . Ice basically disappears in these before and after picture . In fact , you could see serious change from just two yr ago .

National Geographic writes :

Glacier National Park is losing its iconic glacier to a changing mood . In the mid-1800s , this Montana landscape was covered by 150 glacier — today only 25 stay . To show the drop-off in glacier sizing , scientists from the USGS Northern Rocky Mountain Science Center photograph the same region where glaciers were photographed in the early 1900s . Dan Fagre , a USGS enquiry ecologist , has been studying climate change in the park for more than 20 years . Fagre and his colleagues discuss what disappear glaciers and clime alteration imply for the hereafter of the parking lot , which is carry to be nearly glacier free by 2030 , based on present warming trends .