Yellowstone National Park's geology staff reported an unusually large summer cleanup in its hydrothermal areas, recovering over 20,000 pieces of trash, 5,600 rocks and sticks, and nearly 300 hats. The totals, shared by AGU Eos, mark a record-setting year for debris removal from the geyser basins and hot spring terraces.
Most of the collected material appears to be visitor-generated litter, though the rocks and sticks may have been tossed in intentionally or washed in naturally. The nearly 300 hats are a notable curiosity, suggesting that windy conditions or careless leaning over railings send souvenirs into the scalding water.
Park officials have long warned that throwing objects into thermal features can clog vents and alter the delicate plumbing that feeds geysers and hot springs. The record haul underscores the ongoing challenge of balancing public access with preserving these fragile, dangerous environments.