senior editor craig miller sat down with national parks director jon jarvis to find out. >> jon jarvis, thanks for taking time with us. >> thank you. >> you and i first met last fall up in glacier national park. you were talking to a group of reporters on a creek. and you said the greatest threat to the integrity of the national park system that you've ever faced is climate change. that's a huge statement. >> i believe every bit of it. glacier national park is the perfect place to do that besides being a beautiful place. gra glacier is the poster child for climate change. based on predictive models we see, within a couple of decades, the glaciers that define glacier national park will literally be gone. glaciers store water. they provide a refrigerator service basically for free for streams that support wild trout and other species. all of that is going to change. the basic integrity for our national parks is being challenged by climate change. >> california has a huge stake in this. i think i counted more than 20 parks, monuments -- >> 25. >> 25. you know the exact number. joshua tree

on this program last week, jeff jarvis was critical of the coverage of the story as we knew it then. let me play a clip from that program. >> it's a fine story for gawker absolutely, it's a fine story for jon stewart who pointed out that bloggers did reporting on this. but all in all, what's the real story here? you know, that a congressman has a penis? let's stipulate that. there's no news in that. >> to his credit, jeff jarvis went on his blog the next day after weiner admitted he was lying. i think he deserves a pat on the back for that. >>> after the break, many news outlets have been asking you to help examine the 24,000 sarah palin e-mails. are journalists just looking for dirt? at 190 miles per hour, the wind will literally lift ordinary windshield wipers off the glass. so, did we build a slower car? or design wipers that could handle anything? what do you think? the cadillac cts-v, the world's fastest production sedan. we don't just make luxury cars, we make cadillacs so i take one a day men's 50+ advantage. as a manager, my team counts on me to stay focused. it's the only co