Push these over, say rangers at Yosemite National Park

YOSEMITE, Calif. (KSEE/KGPE) - Have you ever passed by a rock cairn and felt the urge to knock it over? Well, officials with Yosemite National Park strongly advise that you do.Rock cairns are man-made piles of rock stacked on top of each other.
According to park rangers, Leave No Trace ethics states that when recreating in wilderness spaces, the goal is to leave no signs of human impact on the land so as to respect the other creatures living in it. What’s so unique about New Mexico’s