have fun getting back up. reporter: she did and the kept going. visiting the grand canyon, teton national park, yellotone, joshua tree and glacier national park and redwood national park. hey, grandma, where are we? we re in the middle of a redwood forest. how do you feel when you look up at these trees? they make you feel very small. does it make you feel very young? not me. i ve walked too many miles. reporter: and she s still walking. texas and new mexico next. tonight, we re cheering for grandma joy. 32 parks to go. she turns 90 next year. i m david muir. we ll see you tomorrow. good night.
there is more political chaos in puerto rico after governor ricardo rossello announced his resignation. today his designated replacement, wanda vasquez said she doesn t want the top job and asked the departing governor to appoint someone else rossello will step down friday following weeks of mass protests over a corruption scandal and his inappropriate texts that went public. in italy a spectacular show of nature this weekend mt. etna erupting in sicily, filling the night sky with volcano ash and spewing out lava two airports closed briefly. mt. etna is the tallest an most active volcano, erupting often and rarely causing damage. back in this country, they are the biggest, strongest trees in the world, the redwoods it is that strength some hope to harness to slow climate change anne thompson on one tree farmer s higher calling. reporter: here in nature s cathedral, a ray of hope to
combat climate chang that s only found by going up and up jake, why come all the way up here to get your clones? we want the best needles we can for propagation. reporter: that s where arborist jake milar begins the process of cloning the ancient trees. close to a thousand years old. it s pretty amazing. reporter: amazing when you consider the decimation that this forest has survived it looks lush and dense but it is not what it was once or what some say should be. pretty much all of it was harvested in the 20th century by humans for use in houses and other commercial uses. reporter: among the 5% left are what jake s father david calls champion trees. every time i walk through an old growth redwood forest it never ceases to amaze me. reporter: like dr. seuss
help whata whistleblower now claims and a giant challenge. why come all the way up here to get your cocones? why the redwoods of california are being tapped for a higher calling announcer: this is nbc nightly news with kate snow good evening. we begin tonight with a shake-up at the highest level of america s national security network. dan coats, the director of national intelligence, charged with overseeing the country s intelligence agencies, is stepping down in less than three during his tenure, coats public assessments often contradicted those of the president late today the president named his successor. hans nichols is at the white house. hans reporter: kate, it s believed coats will leave august 15th, marking the end of a tumultuous
systems built to try to predict what you like and what you are going to do next so they can sell you things. reporter: that s the point. as machines get smarter, expensive human resources won t be needed to listen in this scares a lot of us what can consumers do to protect themselves the easiest thing is disable siri go to settings on the phone. scroll down to siri and type listen for hey, siri and press home for siri. turn both of those off you can turn it back on at any time that just deletes your user data each time. kate molly, thank you. when we come back, the heights to which one man is going to fight climate change. also, the unique program teaching young people real life saving lessons