Being even a small part this year of the centennial celebrations for Zion and Grand Canyon National Parks has been inspiring. I had the honor of writing a few pieces about these events; this is one of them. Part of the joy was that these are, indeed, commemorations of 100 years of national commitment and personal commitments of individual Americans to their preservation. But I will not be here for the next such event; neither will most of those reading this. Please remember that the next one is for our grandchildren and great-grandchildren. What President Teddy Roosevelt said of Yellowstone National Park in 1903 carries for all of these remarkable shared treasures: All of us, he said, looking forward 100 years and beyond, must “jealously [safeguard] and [preserve] the scenery, the forests, and the wild creatures.” Cherish this jealousy, practice it.