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    • Figure 1. 

      Beach closure at Imperial Beach, San Diego, CA, USA on August 14, 2022. A yellow sign warns residents and tourists of ongoing pollution from the Tijuana river. Sewage-related bacteria, consistently exceeding health standards, originate in Tijuana and are carried by the river, causing persistent water quality issues and beach closures in the area for years. More information is available from the San Diego Department of Environmental Health and Quality: www.sdbeachinfo.com. Photo by Greg Bulla on Unsplash.