m. jackson want us to see one more thing. calls a glacial grave yard. >> this is broken down bits of glaciers that have been here for centuries. >> reporter: we paddled through a paradox. >> you are watching total collapse. >> reporter: a lagoon of are wal collapse. >> a lag beautiful destruction. but she has not lost hope. she says we can still keep the planet from overheating and give the glaciers a chance to grow.e >> that means you and i have to act now. i want people to think about the future with ice. and that's what i fight for. >> reporter: ben tracy, cbs news, iceland. >> duncan: still ahead on the cbs weekend news, the new sound on the radio reaching an audience that has been waiting for a change. managing type 2 diabetes? on it. -on it. on it, with jardiance. meet the people who are managing type 2 diabetes and heart risk with jardiance. jardiance is a once-daily pill that can reduce the risk of cardiovascular death for adults who also have known heart disease. so it could help save your life from a heart attack or

he told m that if teaching at nyu and realizing how few of his students of an album that he and many considered a milestone of popular music. michael jackson's foley. >> -- thriller up . >> that is when i knew everything is up for grabs. i can never take for granted that history will be remembered. it is not glamorous but who gets into the rap game to want to be your hall monitor teacher? reporter: time to remember history. >> you can say that i am music hall monitor. [laughter] reporter: there is another connecting thread embedded in the summer of soul film project. >>> one embedded in the summer of soul project. 1969 was the year of woodstock. the film that came at the following year help define and enshrine the era of music. the harlem festival. he never found a distributor work the footage was in the basement for decades. >> i wonder if this film were a lot of the same would it have found me. not only african-americans but people in general. i thought instantly this could change lives.>>> it raises the question about what gets remembered. woodstock did, the harlem cultural festival did not. why has it been so hard to preserve this and ot