Drive to the northern corner of Montana and you'll discover a national park filled with soaring mountain peaks, sparkling teal-blue lakes, more than 2,000 plant species, and hundreds of animal species. Glacier National Park is one of the most beautiful parks in the country and has been a world biosphere reserve since 1974. But the glaciers are in trouble from global warming. Scientists estimate that all the glaciers in the park will be gone by the year 2030. Find out what people are doing to help preserve this national treasure.