Historical sulfur dioxide pollution damaged world's oldest rock art at Murujuga, study suggests

A new study suggests that past exposure to sulfur dioxide — not current industrial emissions — is the likely cause of increased porosity in the rocks at Murujuga, Australia, home to the world's largest and oldest collection of ancient rock art. The artworks were created by the Ngarda-Ngarli people tens of thousands of years ago. The findings could reshape conservation strategies for the site.