hi, my name is miriam nielsen and i'm working toward my phd at columbia university studying hydro climate youtube videos about climate change and climate activism. frankly, the last several years, the northern hemisphere especially, has been seeing these intense, dramatic heatwaves that are predominantly caused by increasing global temperature, by climate change. and we're seeing that in places like the uk and california. you know, what you're seeing in yosemite and the sierra is...more fires. when i first moved up here about 25 years ago, we'd get maybe one major fire every five to ten years. we're getting major fires every year now, and multiple ones. the problems are the melting snow on the glaciers. - so we have a lot more crevasse incidents because the snow- coverage on the glaciers is totally thinned out. i and then many places, i the glaciers are receding. we had to basically stop guiding | certain trips on certain glaciersl because itjust became too dangerous | for a while because the snow bridges| on the glaciers were too thin. and this has increased the number of accidents with

hi, my name is miriam nielsen and i'm working toward my phd at columbia university studying hydro climatere seeing that in places like the uk and california. you know, what you're seeing in yosemite and the sierra is...more fires. when i first moved up here about 25 years ago, we'd get maybe one major fire every five to ten years. we're getting major fires every year now, and multiple ones. the problems are the melting snow on the glaciers. - so we have a lot more crevasse incidents because the snow- coverage on the glaciers is totally thinned out. i and then many places, i the glaciers are receding. we had to basically stop guiding | certain trips on certain glaciersl because itjust became too dangerous | for a while because the snow bridges| on the glaciers were too thin. and this has increased the number of accidents with crevasses. - what basically happened is that the jet stream, which is this meandering current of air, got stuck in one place. and so all of this hot air from northern africa ended up piling up, that led to really, really high temperatures, which impacts everyone from