kathrine kobaji in toke you. kathrine kobaji in toke you.hanks for joining us. play funky space-rock] ♪ ♪ (jane joyce) mountains are "water towers" of the world. at least half of the fresh water we consume comes from mountain ice and snow that melts into rivers and streams. but as earth's climate warms, changes occur in mountain ecosystems that alter both the amount and timing of available fresh water. research conducted at glacier national park documents the changes taking place across this vast mountain landscape. our snowpack, for instance, is heavier during the middle part of the winter but melting earlier. that sends a pulse down the streams earlier in the year, meaning that there's less of it for late in the summer when the stream flows are very low. and in some cases with those snowpacks disappearing so early, the only source of base flow for those streams is melting glaciers. (jane joyce) changes in the water cycle are not the only result of a warming climate. (dr. dan fagre) our tree lines are changing rapidly as well. many of the b