The Economic Times

Before the 1960s, Yellowstones Morning Glory Pool was deep blue. Visitors threw in pennies, rocks and garbage, and its color changed

Yellowstone National Park is grappling with an escalating issue of litter left by visitors. This debris often contaminates the park's delicate hydrothermal areas, leading to ecological damage. In recent efforts, staff have collected over 20,100 pieces of trash and 5,600 rocks, discovering items like hats, coins, AirPods, and children's toys among the debris.