memorial, takes pictures, and talks. i just want to confront this demon of carnage, if you want to call it that. and for me to do it i have to come here. reporter: he s lived in highland park for 26 years, and on july 4th went to the parade with his wife and grandchildren. we re 50 feet from the shooter and the easiest targets possible. and why we weren t shot i can t figure out. reporter: he heard the shots and ran, then saw the injuries and one of the dead. here he is on surveillance video. i just couldn t wrap my head around what had just happened. i kept trying to figure it out. and i guess i m still trying to figure out what makes somebody this evil. reporter: it s the question this entire community is trying to answer. for the first two days i would say am i still sleeping? is this a nightmare? wake me up because it cannot feel real. and you go through these waves where you re numb for a little bit and then you get angry and then you feel guilty and overwh
at california s sequoia national park, home of the world s largest trees, wildfires have burned large swaths of the giant sequoia groves. wildfires and extreme heat have forced california s yosemite national park to close several times in recent years. meanwhile glacier national park in montana is rapidly losing its namesake feature. this is the glacier in 1910 versus 2021. these are places that tell critical stories of our history and people and culture, and these places are not going to be able to withstand these repeat assaults. reporter: more frequent, more intense natural disasters will drastically transform national parkland scapes. and then there s the economic loss. in 2021 alone our national parks saw over 297 million